Checklist of lichens and lichenicolous fungi of Washington (USA)
supervised by Katherine A. Glew, University of Washington, Seattle, Washington

Preliminary version 1 October 2008

  1. Acarospora americana H. Magn. - Eyerdam (1960: 107)
  2. Acarospora fuscata (Nyl.) Arnold - Douglas (1974: 584), Thomson (1997: 24)
  3. Acarospora oxytona (Ach.) A. Massal. - Thomson (1997: 29)
  4. Acarospora schleicheri (Ach.) A. Massal. - Thomson (1997: 33)
  5. Acarospora smaragdula (Wahlenb. in Ach.) A. Massal. - Thomson (1997: 34)
  6. Acarospora washingtonensis H. Magn. - Douglas (1974: 584)

  7. Agyrophora lyngei (Schol.) Llano - Douglas (1974: 584), Thomson (1984: 30)
  8. Agyrophora rigida (DR.) Llano - Thomson (1984: 31)
  9. Agyrophora scholanderi Llano - Thomson (1984: 32)

    Alectoria cana - Eyerdam (1960: 107)

  10. Alectoria nigricans (Ach.) Nyl. - Douglas (1974: 584), Thomson (1984: 35)
  11. Alectoria ochroleuca (Hoffm.) A. Massal. - Douglas (1974: 584)
  12. Alectoria sarmentosa (Ach.) Ach. - Douglas (1974: 584)
  13. Alectoria vexillifera (Nyl.) Stitz. - Thomson (1984: 38)

  14. Amandinea punctata (Hoffm.) Coppins & Scheid. - Thomson (1997: 138 sub Buellia punctata)

  15. Amygdalaria paneola (Ach.) Hertel & Brodo - Thomson (1997: 42)

  16. Arthonia radiata (Pers.) Ach. - Douglas (1974: 584)
  17. Arthopyrenia analeptella (Nyl.) Arnold - Douglas (1974: 584)
  18. Arthopyrenia sublitoralis (Leighton) Arnold - Thomson (1997: 49)

  19. Aspicilia aliena (Zahlbr.) Oxner - Thomson (1997: 58)
  20. Aspicilia caesiocinerea (Nyl. ex Malbr.) Arnold - Thomson (1997: 65)
  21. Aspicilia cinerea (L.) Körb. s.l. - Thomson (1997: 68)
  22. Aspicilia subertegens Arnold - Thomson (1997: 95)

  23. Bacidia albescens (Kremp.) Zw. - Douglas (1974: 584)
  24. Bacidia rubella (Hoffm.) A. Massal. - Thomson (1997: 107)

  25. Baeomyces rufus (Huds.) Rebent. - Douglas (1974: 584), Thomson (1984: 52)

  26. Bellemerea alpina (Sommerf.) Clauz. & Roux - Thomson (1997: 115)
  27. Bellemerea cinereorufescens (Ach.) Clauz. & Roux - Thomson (1997: 116)

  28. Biatorella hemispaerica Anzi - Thomson (1997: 119)
  29. Biatorella kulshanensis Herre - Douglas (1974: 584)

  30. Brodoa intestiniformis xxx - Douglas (1974: 586 as Hypogymnia intestiniformis)

  31. Bryonora castanea (Hepp) Poelt - Thomson (1997: 122)

  32. Bryoria capillaris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 55)
  33. Bryoria chalybeiformis (L.) Brodo & D. Hawksw. - Thomson (1984: 56)
  34. Bryoria fremontii Tuck. - Douglas (1974: 584 sub Alectoria fremontii)
  35. Bryoria fuscescens (Gyeln.) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria jubata), Thomson (1984: 57)
  36. Bryoria glabra (Mot.) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria glabra), Thomson (1984: 58)
  37. Bryoria lanestris (Ach.) Brodo & D. Hawksw. - Thomson (1984: 59)
  38. Bryoria pseudocapillaris Brodo & D. Hawksw. - Geiser et al. (2004: 105)
  39. Bryoria pseudofuscenscens (Gyeln.) Brodo & D. Hawksw. - Thomson (1984: 63)

  40. Buellia alboatra (Hoffm.) Th. Fr. - Douglas (1974: 584), Thomson (1997: 127)
  41. Buellia disciformis (Fr.) Mudd - Douglas (1974: 584), Thomson (1997: 129)
    Buellia disciformis var. saxicola - Eyerdam (1960: 107)
  42. Buellia epigaea (Hoffm.) Tuck. - Douglas (1974: 584)
  43. Buellia geophila (Flörke ex Sommerf.) Lynge - Thomson (1997: 133)
  44. Buellia papillata (Sommerf.) Tuck. - Douglas (1974: 584), Thomson (1997: 136)
  45. Buellia zahlbrucknerii J. Stein - Douglas (1974: 584)

  46. Calicium abietinum Pers. - Thomson (1997: 143)
  47. Calicium viride Pers. - Douglas (1974: 584), Thomson (1997: 146)

  48. Caloplaca atrosanguinea (Merr.) Lamb. - Douglas (1974: 584)
  49. Caloplaca cerina (Ehrh.) Th. Fr. - Douglas (1974: 584), Thomson (1997: 154)
  50. Caloplaca citrina (Hoffm.) Th. Fr. - Thomson (1997: 155)
  51. Caloplaca crenularia (With.) J. R. Laundon - Thomson (1997: 157)
  52. Caloplaca exsecuta (Nyl.) Dalla Torre & Sarnth. - Thomson (1997: 160)
  53. Caloplaca ferruginea (Huds.) Th. Fr. - Douglas (1974: 584)
  54. Caloplaca fraudans (Th. Fr.) Oliv. - Thomson (1997: 162)
  55. Caloplaca holocarpa (Hoffm.) Wade - Douglas (1974: 585), Thomson (1997: 164)
  56. Caloplaca jungermanniae (Vahl) Th. Fr. - Herre (1917:), Douglas (1974: 585), Thomson (1997: 166)
  57. Caloplaca saxicola (Hoffm.) Nordin - Douglas (1974: 585 sub Caloplaca murorum)
  58. Caloplaca scopularis (Nyl.) Lettau - Thomson (1997: 168)
  59. Caloplaca stillicidiorum (Vahl) Lynge - Douglas (1974: 585), Thomson (1997: 172)
  60. Caloplaca tetraspora (Nyl.) Oliv. - Thomson (1997: 172)
  61. Caloplaca tiroliensis Zahlbr. - Thomson (1997: 173)
  62. Caloplaca tominii Savicz - Thomson (1997: 173)

  63. Candelariella aurella (Hoffm.) Zahlbr. - Herre (1917:), Douglas (1974: 585), Thomson (1997: 182)
  64. Candelariella terrigena Räsänen - Douglas (1974: 585), Thomson (1997: 187)
  65. Candelariella vitellina (Hoffm.) Müll. Arg. - Thomson (1997: 189)

    Catillaria franciscana (Tuck.) Herre - Eyerdam (1960: 107)

  66. Catillaria glauconigricans (Tuck.) Hasse - Thomson (1997: 197)

  67. Catinaria atropurpurea (Schaer.) Vezda & Poelt - Thomson (1997: 201)

  68. Cetraria aculeata (Schreb.) xxx - Imshaug (1957: ), Douglas (1974: 586 as Cornicularia aculeata)
  69. Cetraria chlorophylla (Willd.) Vain. - Herre (1917:), Douglas (1974: 585), Thomson (1984: 73)
  70. Cetraria ciliaris Ach. - Douglas (1974: 585)
  71. Cetraria commixta (Nyl.) Th. Fr. - Imshaugh (1957:), Douglas (1974: 585), Thomson (1984: 75)
  72. Cetraria cucullata (Bell.) Ach. - Imshaugh (1957), Douglas (1974: 585), Thomson (1984: 76)
  73. Cetraria ericetorum Opiz - Douglas (1974: 585), Thomson (1984: 79)
  74. Cetraria hepatizon (Ach.) Vain. - Imshaugh (1957:), Douglas (1974: 585), Thomson (1984: 82)
  75. Cetraria idahoensis Essl. - Esslinger (1971: 366 Protolog), Douglas (1974: 585 as Cetraria idahoensis) Type in DUKE

  76. Cetraria islandica (L.) Ach. - Herre (1917:), Howard (1950:), Imshaugh (1957:), Douglas (1974: 585), Thomson (1984: 84)
  77. vulpicida juniperina (L.) xxx - Howard (1950 sub Cetraria juniperina), Esslinger (1973 sub Cetraria juniperina), Douglas (1974: 585 sub Cetraria juniperina)

  78. Cetraria laevigata Rass. - Thomson (1984: 88)
  79. Cetraria nivalis (L.) Ach. - Imshaugh (1957:), Douglas (1974: 585), Thomson (1984: 92)
  80. Cetraria pinastri (Scop.) S. Gray - Imshaugh (1957: as Cetraria pinastri), Thomson (1984: 93 as Cetraria pinastri)

  81. Cetraria platyphylla (Tuck.) Herre - Herre (1917), Douglas (1974: 585)
  82. Cetraria subalpina Imshaugh - Douglas (1974: 585)
  83. Cetrelia cetrarioides (Del. ex Duby) W. L. Culb. & C. Culb. - Eyerdam (1960:), Culberson & Culberson (1968), Douglas (1974: 585), Thell et al. (1998: 309) DNA: ITS

  84. Cladonia anomaea (Ach.) Ahti & P. James - Thomson (1984: 109)
  85. Cladonia arbuscula (Wallr.) Rabenh. - Herre (1917: ), Douglas (1974: 585 sub Cladina arbuscula), Thomson (1984: 110)
  86. Cladonia bacillaris (Ach.) Nyl. - Herre (1917:), Douglas (1974: 585), Thomson (1984: 111)
  87. Cladonia bellidiflora (Ach.) Schaer. - Herre (1917), Eyerdam (1960), Douglas (1974: 585), Thomson (1984: 113)
    Cladonia bellidiflora f. coccocephala - Eyerdam (1960: 107)
    Cladonia bellidiflora f. hookeri - Eyerdam (1960: 107)
  88. Cladonia capitata (Michx.) Spreng. - Eyerdam (1960), Douglas (1974: 585)
    Cladonia capitata f. microcarpa Evans - Eyerdam (1960: 107)
  89. Cladonia cariosa (Ach.) Spreng. - Howard (1950), Douglas (1974: 585), Thomson (1984: 116)
  90. Cladonia carneola (Fr.) Fr. - Douglas (1974: 585)
  91. Cladonia cenotea (Ach.) Schaer. - Thomson (1984: 118)
  92. Cladonia chlorophaea (Flörke ex. Sommerf.) Spreng. - Howard (1950), Eyerdam (1960: 107 as Cladonia chlorophaea f. simplex), Douglas (1974: 585), Thomson (1984: 119)
  93. Cladonia coccifera (L.) Willd. - Douglas (1974: 586), Thomson (1984: 121)
  94. Cladonia coniocraea (Flörke) Spreng. - Howard (1950), Eyerdam (1960: 107 as Cladonia coniocraea f. ceratodes, f. finkii, f. truncata), Douglas (1974: 586), Thomson (1984: 122)
  95. Cladonia cornuta (L.) Hoffm. - Eyerdam (1960: 108), Douglas (1974: 586), Thomson (1984: 124)
    Cladonia cornutoradiata (Coem.) Vain. - Eyerdam (1960: 108)
  96. Cladonia cryptochlorophaea Asah. - Thomson (1984: 126)
  97. Cladonia cyanipes (Somm.) Nyl. - Thomson (1984: 127)
  98. Cladonia deformis (L.) Hoffm. - Douglas (1974: 586)
    Cladonia degenerans f. phyllophora - Eyerdam (1960: 108)
  99. Cladonia digitata (L.) Hoffm. - Thomson (1984: 131)
  100. Cladonia ecmocyna Leight. - Douglas (1974: 586), Thomson (1984: 132)
  101. Cladonia fimbriata (L.) Fr. - Douglas (1974: 586), Thomson (1984: 133)
  102. Cladonia floerkeana (Fr.) Flörke - Eyerdam (1960: 107), Douglas (1974: 586)
  103. Cladonia furcata (Huds.) Schrad. - Eyerdam (1960: ), Douglas (1974: 586)
    Cladonia furcata var. racemosa - Eyerdam (1960: 108)
  104. Cladonia gonecha (Ach.) Asah. - Douglas (1974: 586)
  105. Cladonia gracilis subsp. turbinata (Ach.) Ahti - Thomson (1984: 136)
  106. Cladonia gracilis (L.) Willd. var. gracilis - Herre (1917: ), Eyerdam (1960: ), Douglas (1974: 586), Thomson (1984: 137)
    Cladonia gracilis var. dilatata - Eyerdam (1960: 108)
  107. Cladonia grayi Merrl. - Thomson (1984: 139)
  108. Cladonia hookeri Tuck. - Herre (1943: ), Douglas (1974: 586)
  109. Cladonia lepidota Nyl. - Eyerdam (1960: 108 as Cladonia lepidota var. stricta f. pterophora), Douglas (1974: 586)
  110. Cladonia macilenta Hoffm. - Herre (1917: ), Eyerdam (1960: 108 as Cladonia macilenta f. granulosa and f. stryracella)
  111. Cladonia macrophyllodes Nyl. - Thomson (1984: 143)
  112. Cladonia major (Hag.) Sandst. - Thomson (1984: 144)
  113. Cladonia merochlorophaea Asah. - Thomson (1984: 143)
  114. Cladonia mitis Sandst. - Imshaugh (1957:), Douglas (1974: 585 sub Cladina mitis), Thomson (1984: 148)
  115. Cladonia multiformis Merr. - Douglas (1974: 586), Thomson (1984: 149)
    Cladonia multiformis f. subascypha - Eyerdam (1960: 108)
    Cladonia ochrochlora Flörke - Eyerdam (1960: 108)
  116. Cladonia phyllophora Ehrh. ex Hoffm. - Eyerdam (1960: ), Douglas (1974: 586), Thomson (1984: 153)
  117. Cladonia pityrea (Flörke) Fr. - Eyerdam (1960: 108 as Cladonia pityrea f. cornuta, f. squamulifera and f. zwackhii), Douglas (1974: 586)
  118. Cladonia pyxidata (L.) Hoffm. - Herre (1917: ), Imshaug (1957: ), Eyerdam (1960: 108 as Cladonia pyxidata var. neglecta), Douglas (1974: 586), Thomson (1984: 158)
  119. Cladonia rangiferina (L.) F. H. Wigg. - Herre (1917:), Douglas (1974: 585 sub Cladina rangiferina), Thomson (1984: 159)
    Cladonia scabriuscula f. surrecta - Eyerdam (1960: 108)
  120. Cladonia squamosa (Scop.) Hoffm. - Herre (1917: ), Douglas (1974: 586), Thomson (1984: 161)
  121. Cladonia stricta (Nyl.) Nyl. - Thomson (1984: 164)
  122. Cladonia subcervicornis (Vain.) Du Rietz - Thomson (1984: 165)
  123. Cladonia subsquamosa (Nyl.) Vain. - Howard (1950: ), Douglas (1974: 586)
  124. Cladonia subulata (L.) F. H. Wigg. - Eyerdam (1960: ), Douglas (1974: 586), Thomson (1984: 168)
  125. Cladonia turgida Ehrh. ex Hoffm. - Eyerdam (1960: 108), Thomson (1984: 172)
  126. Cladonia uncialis (L.) F. H. Wigg. - Thomson (1984: 173)
  127. Cladonia verticillata (Hoffm.) Schaer. - Herre (1917: ), Douglas (1974: 586), Thomson (1984: 174)

  128. Coniocybe furfuracea (L.) Ach. - Eyerdam (1960: 108), Thomson (1997: 210)

  129. Cornicularia aculeata (Schreb.) Ach. - Thomson (1984: 198)
  130. Cornicularia normoerica (Gunn.) DR. - Imshaug (1957: ), Douglas (1974: 586), Thomson (1984: 201)

  131. Cyphelium inquinans (Sm. in Sm. & Sow.) Trevisan - Herre (1917: ), Douglas (1974: 586), Thomson (1997: 212)
  132. Cyphelium ocellatum (Körb.) Trevisan - Thomson (1997: 213)
  133. Cyphelium tigillare (Ach.) Ach. - Thomson (1997: 214)

  134. Dactylina arctica (Richards.) Nyl. - Imshaug (1957), Douglas (1974: 586), Thomson (1984: 203)

  135. Dermatocarpon fluviatile (Web.) Th. Fr. - Douglas (1974: 586), Thomson (1984: 213)
  136. Dermatocarpon intestiniforme (Körb.) Hasse - Thomson (1984: 216)
  137. Dermatocarpon meiophyllizum Vain. - Glavich & Geiser (2004: 139)
  138. Dermatocarpon miniatum (L.) Mann. - Howard (1950), Douglas (1974: 586), Thomson (1984: 219)

  139. Diploschistes actinostomus (Pers.) Zahlbr. - Herre (1943), Douglas (1974: 586)
  140. Diploschistes muscorum (Scop.) R. Sant. - Thomson (1997: 218)
  141. Diploschistes scruposus (Schreber) Norman - Douglas (1974: 586), Thomson (1997: 218)

  142. Erioderma sorediatum D. J. Galloway & P. M. Jörg. - Geiser et al. (2004: 106)
  143. Euopsis granatina (Sommerf.) Nyl. - Thomson (1997: 223)

  144. Evernia prunastri (L.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 586)

  145. Fellhanera bouteillei (Desm.) Vezda - Douglas (1974: 585 sub Catillaria bouteilei)

  146. Fisturiella roesleri (Hoechst. ex Schaer.) Bowler & Rundel - Thomson (1984: 233)

  147. Graphis scripta (L.) Ach. - Howard (1950), Douglas (1974: 586)
  148. Gyalecta jenensis (Batsch) Zahlbr. - Thomson (1997: 241)

  149. Haematomma lapponicum Räs. - Douglas (1974: 586)

  150. Heppia lutosa (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 586)

  151. Heterodermia leucomela (L.) Poelt - Geiser et al. (2004: 106)
  152. Hymenelia lacustris (With.) M. Choisy - Thomson (1997: 245)

  153. Hypocenomyce friesii (Ach. in Lilj.) James & Schneider - Thomson (1997: 247)
  154. Hypocenomyce scalaris (Ach. ex Lilj.) M. Choisy - Thomson (1997: 248)

  155. Hypogymnia austerodes Nyl. - Thomson (1984: 237)
  156. Hypogymnia enteromorpha (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 586)
  157. Hypogymnia oroacrctica Krog - Thomson (1984: 239)
  158. Hypogymnia physodes (L.) Nyl. - Herre (1917: ), Douglas (1974: 587), Thomson (1984: 241)
  159. Hypogymnia vittata (Ach.) Gas. - Howard (1950), Douglas (1974: 587), Thomson (1984: 243)

  160. Icmadophila ericetorum (L.) Zahlbr. - Herre (1917: ), Howard (1950: ), Douglas (1974: 587), Thomson (1997: 249)

  161. Lecania dimera (Nyl.) Th. Fr. - Herre (1917: ), Douglas (1974: 587)

  162. Lecanora alpina Somm. - Herre (1917: ), Douglas (1974: 587)
  163. Lecanora badia (Hoffm.) Ach. - Thomson (1997: 269)
  164. Lecanora caesiocinerea Nyl. - Douglas (1974: 587)
  165. Lecanora calcarea (L.) Somm. - Herre (1943: ), Howard (1950: ), Douglas (1974: 587)
  166. Lecanora cenisia Ach. - Douglas (1974: 587), Thomson (1997: 272)
  167. Lecanora chlarotera Nyl. - Thomson (1997: 273)
    Lecanora cinerea var. microspora Fink - Eyerdam (1960: 108)
  168. Lecanora cinereofusca H. Magn. - Douglas (1974: 587)
  169. Lecanora circumborealis Brodo & Vitik. - Thomson (1997: 274)
  170. Lecanora coilocarpa (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 587)
    Lecanora conizaea - Eyerdam (1960: 108)
    Lecanora contorta (Hoffm.) Stein - Eyerdam (1960: 108)
    Lecanora diffracta Ach. - Eyerdam (1960: 108)
  171. Lecanora dispersa (Pers.) Sommerf. - Thomson (1997: 278)
  172. Lecanora epibryon (Ach.) Ach. - Douglas (1974: 587)
  173. Lecanora expallens Ach. - Thomson (1997: 281)
  174. Lecanora frustulosa (Dicks.) Ach. - Herre (1917), Douglas (1974: 587)
  175. Lecanora gibbosula H. Magn. - Herre (1917: ), Howard (1950: ), Douglas (1974: 587)
  176. Lecanora grantii H. Magn. - Thomson (1997: 284)
  177. Lecanora hagenii (Ach.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 587), Thomson (1997:286)
  178. Lecanora laevata (Ach.) Nyl. - Herre (1943), Douglas (1974: 587)
  179. Lecanora marginata (Schaer.) Hertel & Rambold- Thomson (1997: 291)
    Lecanora melaena (Hedl.) Fink - Eyerdam (1960: 108)
  180. Lecanora muralis (Schreb.) Rabenh. - Howard (1950: ), Douglas (1974: 587), Thomson (1997: 295)
  181. Lecanora orae-frigidae R. Sant. - Thomson (1997: 297)
  182. Lecanora pacifica Tuck. - Herre (1917: ), Douglas (1974: 587)
  183. Lecanora polytropa (Ehrh. in Hoffm.) Rabenh. - Herre (1917: ), Douglas (1974: 587), Thomson (1997: 299)
  184. Lecanora pulicaris - Thomson (1997: 301)
  185. Lecanora rupicola (L.) Zahlbr. - Douglas (1974: 587), Thomson (1997: 303)
  186. Lecanora subfusca (L.) Ach. - Herre (1917: ), Douglas (1974: 587)
  187. Lecanora subrugosa Nyl. - Thomson (1997: 308)
  188. Lecanora supertegens (Arnold) Zahlbr. - Douglas (1974: 587)
  189. Lecanora symmicta (Ach.) Ach. - Thomson (1997: 309)
  190. Lecanora umbrosa Degel. - Anderson (1974: 44)
  191. Lecanora varia (Hoffm.) Ach. - Herre (1917), Douglas (1974: 587), Thomson (1997: 311)

  192. Lecidea atrobrunnea (Ramond ex Lam. & DC.) Schaer. - Douglas (1974: 587), Thomson (1997: 327)
  193. Lecidea auriculata Th. Fr. - Howard (1950: ), Douglas (1974: 587), Thomson (1997: 329)
  194. Lecidea berengeriana (A. Massal.) Th. Fr. - Douglas (1974: 587), Thomson (1997: 331)
  195. Lecidea caesioatra Schaer. - Herre (1917: ), Howard (1950: )
    Lecidea cascadensis H. Magn. - Eyerdam (1960: 108)
  196. Lecidea cineratra Zahlbr. - Douglas (1974: 587)
  197. Lecidea cinnabarina Sommerf. - Thomson (1997: 336)
    Lecidea coarctica (Sm.) Nyl. - Eyerdam (1960: 109)
  198. Lecidea confluens (W. A. Weber) Ach. - Douglas (1974: 587), Thomson (1997: 339)
  199. Lecidea cyathoides (Ach.) Ach. - Herre (1917: ), Douglas (1974: 588)
  200. Lecidea furvonigrans (Tuck.) Zahlbr. - Douglas (1974: 588)
  201. Lecidea fuscescens Somm. - Douglas (1974: 588)
  202. Lecidea fuscoatra (L.) Ach. - Thomson (1997: 347)
  203. Lecidea glaucophaea Körb. - Douglas (1974: 588)
  204. Lecidea globifera Ach. - Howard (1950: ), Douglas (1974: 588)
  205. Lecidea glomerulosa (DC.) Steud. - Douglas (1974: 588)
  206. Lecidea granulosa (Ehrh.) Ach. - Howard (1950: )
  207. Lecidea hypnorum Lib. - Thomson (1997: 351)
  208. Lecidea lactea Flörke ex Schaerer - Thomson (1997: 355)
  209. Lecidea lapicida (Ach.) Ach. - Howard (1950: ), Douglas (1974: 588), Thomson (1997: 357)
  210. Lecidea leucothallina Arnold - Thomson (1997: 360)
  211. Lecidea lithophila (Ach.) Ach. - Thomson (1997: 362)
  212. Lecidea lurida (Dill.) Ach. - Howard (1950: ), Douglas (1974: 588)
  213. Lecidea marginata Schaer. - Herre (1943: ), Douglas (1974: 588)
  214. Lecidea paddensis (Tuck.) Zahlbr. - Douglas (1974: 588)
  215. Lecidea paupercula Th. Fr. - Thomson (1997: 369)
  216. Lecidea plana Lahm ex Körb. - Douglas (1974: 588)
    Lecidea platycarpa Ach. - Eyerdam (1960: 109)
  217. Lecidea rubiformis (Wahlenb. ex Ach.) Wahlenb. - Herre (1917: ), Douglas (1974: 588)
  218. Lecidea rufonigra (Tuck.) Nyl. - Douglas (1974: 588)
  219. Lecidea sanguineoatra (Wulf.) Ach. - Douglas (1974: 588)
  220. Lecidea tessellata Flörke - Herre (1917: ), Howard (1950: ), Douglas (1974: 588), Thomson (1997: 384)
  221. Lecidea tornoensis Nyl. - Douglas (1974: 588), Thomson (1997: 387)
  222. Lecidea uliginosa (Schrad.) Ach. - Douglas (1974: 588)
  223. Lecidea vernalis (L.) Ach. - Thomson (1997: 389)

  224. Lecidella carpathica Körb. - Thomson (1997: 395)
  225. Lecidella elaeochroma (Ach.) Hazslin. - Herre (1943: ), Douglas (1974: 588), Thomson (1997: 396)
  226. Lecidella euphorea (Flörke) Hertel - Thomson (1997: 398)
  227. Lecidella stigmatea (Ach.) Hertel & Leuck. - Douglas (1974: 588), Thomson (1997: 402)
  228. Lecidella wulfenii (Hepp) Körb. - Thomson (1997: 403)

  229. Lecidoma demissum (Rutstr.) Schneider & Hertel - Douglas (1974: 588 as Lecidea demissa), Thomson (1997: 405)

  230. Leioderma sorediatum D. J. Galloway & P. M. Jørg. - Geiser et al. (2004: 106)
  231. Lepraria membranacea (Dicks.) Vain. - Douglas (1974: 588)
  232. Lepraria neglecta (Nyl.) Lett. - Douglas (1974: 588)

  233. Leprocaulon subalbicans (J. M. Lamb) J. M. Lamb & Ward - Thomson (1984: 250)

  234. Leptochidium albociliatum (Desm.) M. Choisy - Thomson (1984: 252)

  235. Leptogium brebissonii Mont. - Geiser et al. (2004: 107)
  236. Leptogium lichenoides (L.) Zahlbr. - Howard (1950: ), Douglas (1974: 588), Thomson (1984: 257)
  237. Leptogium minutissimum (Dicks.) Fr. - Thomson (1984: 259)
  238. Leptogium palmatum (Huds.) Mont. in Webb. & Berth.- Thomson (1984: 260)
  239. Leptogium rivale Tuck. - Glavich & Geiser (2007: 8)
  240. Leptogium saturninum (Dicks.) Nyl. Thomson (1984: 262)
  241. Leptogium sinuatum (Huds.) Mass. - Thomson (1984: 263)
  242. Leptogium subaridum P. M. Jørg. & Goward - Aragón et al. (2004: 165)
  243. Leptogium tenuissimum (Dicks.) Fr. - Herre (1917: ), Douglas (1974: 588)

  244. Letharia vulpina (L.) Hue - Herre (1917: ), Douglas (1974: 588)

  245. Lichenoconium christiansenii M. S. Cole & D. Hawksw. - Cole & Hawksworth (2004: 1 Protologue) Type in "K(M)"

  246. Lobaria hallii (Tuck.) Zahlbr. - Thomson (1984: 266)
  247. Lobaria linita (Ach.) Rabenh. - Douglas (1974: 588), Thomson (1984: 269)
  248. Lobaria oregana (Tuck.) Müll. Arg. - Herre (1917: ), Howard (1950: ), Douglas (1974: 588)
  249. Lobaria pulmonaria (L.) Hoffm. - Herre (1917: ), Douglas (1974: 588)
  250. Lobaria scrobiculata (Scop.) DC. - Herre (1943: ), Douglas (1974: 588), Thomson (1984: 271)

  251. Lopadium pezizoideum (Ach.) Körb. - Thomson (1997: 411)

  252. Massalongia carnosa (Dicks.) Körb. - Herre (1917: ), Douglas (1974: 588), Thomson (1984: 274)

  253. Melanohalea infumata (Nyl.) O. Blanco et al. - Imshaug (1957: as Parmelia infumata), Douglas (1974: 589 as Parmelia infumata), Thomson (1984: 304 as Parmelia infumata)

  254. Menegazzia terebrata (Hoffm.) A. Massal. - Howard (1955: ), Douglas (1974: 588)

  255. Micarea denigrata (Fr.) Hedl. - Thomson (1997: 415)
  256. Micarea xanthonica Coppins & Tønsberg - Coppins & Tønsberg (2001: 93 Protolog) Type in Bergen, Norway (BG)

  257. Mycobilimbia sabuletorum (Schreb.) Hafellner - Thomson (1997: 422)

  258. Mycoblastus affinis (Schaer.) Schauer- Thomson (1997: 424)
  259. Mycoblastus sanguinarius (L.) Norman - Douglas (1974: 588), Thomson (1997: 426)

  260. Nephroma bellum (Spreng.) Tuck. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 278)
  261. Nephroma helveticum Ach. - Herre (1917: ), Douglas (1974: 588)
  262. Nephroma laevigatum Ach. - Herre (1917: ), Douglas (1974: 588)
  263. Nephroma parile (Ach.) Ach. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 282)
  264. Nephroma resupinatum (L.) Ach. - Wetmore (1960: ), Douglas (1974: 588), Thomson (1984: 283)

    Nephromopsis californica Gyeln. - Eyerdam (1960: 109)

  265. Neuropogon lambii Imshaug - Weber (1973: ), Douglas (1974: 588)

  266. Niebla cephalota (Tuck.) Rundel & Bowler - Geiser et al. (2004: 107)

  267. Nodobryoria abbreviata - Cole & Hawksworth (2004: 1)

  268. Nodobryoria oregona (Tuck.) Common & Brodo - Douglas (1974: 584 sub Alectoria oregona)
  269. Ochrolechia androgyna (Hoffm.) Arnold - Douglas (1974: 589), Thomson (1997: 430)
  270. Ochrolechia inaequatula (Nyl.) Zahlbr. - Thomson (1997: 434)
  271. Ochrolechia oregonensis H. Magn. - Eyerdam (1960: 109), Douglas (1974: 589)
  272. Ochrolechia pallescens (L.) A. Massal. - Herre (1943: ), Douglas (1974: 589)
  273. Ochrolechia parella (L.) A. Massal. - Douglas (1974: 589)
  274. Ochrolechia tartarea (L.) A. Massal. - Herre (1917: ), Howard (1970: ), Douglas (1974: 589)
  275. Ochrolechia upsaliensis (L.) A. Massal. - Douglas (1974: 589), Thomson (1997: 436)

  276. Omphalodiscus decussatus (Vill.) Schol.- Imshaug (1950: ), Douglas (1974: 589), Thomson (1984: 288)
  277. Omphalodiscus krascheninnikovii (Sav.) Schol. - Thomson (1984: 289)
  278. Omphalodiscus virginis (Schaer.) Schol. - Imshaug (1957: ), Douglas (1974: 589), Thomson (1984: 290)

  279. Opegrapha pulicaris (Hoffm.) Schrad. - Herre (1917: ), Douglas (1974: 589)
  280. Ophioparma lapponica (Räsänen) Hafellner & Rogers - Thomson (1997: 440)

  281. Orphniospora moriopsis (A. Massal.) D. Hawksw. - Thomson (1997: 441)

  282. Pachyospora verrucosa (Ach.) A. Massal. - Thomson (1997: 443)

  283. Pannaria pezizoides (Web.) Trev. - Thomson (1984: 294)
  284. Pannaria rubiginosa (Ach.) Bory - Howard (1950: ), Douglas (1974: 589), Geiser et al. (2004: 107)
  285. Parmelia alpicola Th. Fr. - Imshaug (1957 as Parmelia alpicola), Douglas (1974: 589 as Parmelia alpicola), Thomson (1984: 299 sub Parmelia alpicola)
    Parmelia cetrarioides Del. - Eyerdam (1960: 109)
  286. Parmelia disjuncta Erichs. - Eyerdam (1960: 109), Thomson (1984: 299 sub Parmelia disjuncta)
  287. Parmelia elegantula (Zahlbr.) Szat. - Thomson (1984: 300 sub Parmelia elegantula)
    Parmelia exasperata - Eyerdam (1960: 109)
  288. Melanelia exasperatula (Nyl.) xxx - Thomson (1984: 300 sub Parmelia exasperatula)
    Parmelia fuliginosa - Eyerdam (1960: 109)
  289. Melanelia glabratula (Lamy) Nyl. - Thomson (1984: 303 sub Parmelia glabratula)
    Parmelia laciniatula - Eyerdam (1960: 109 as Parmelia laciniatula)
  290. Parmelia multispora Schneid. - Howard (1950: ), Douglas (1974: 589 as Parmelia multispora)
  291. Parmelia omphalodes (L.) Ach. - Thomson (1984: 308)
  292. Parmelia panniformis (Nyl.) Vain. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 309)
  293. Parmelia perlata (Huds.) Ach. - Herre (1917), Douglas (1974: 589)
  294. Parmelia saxatilis (L.) Ach. - Howard (1950: ), Imshaug (1957), Douglas (1974: 589), Thomson (1984: 310)
  295. Parmelia sorediosa Almb. - Thomson (1984: 312 sub Parmelia sorediosa)
  296. Parmelia stygia var. contrubata (Arn.) Dalla Torre & Sarnth. - Thomson (1984: 315)
  297. Melanelia subaurifera Nyl. - Thomson (1984: 316 sub Parmelia subaurifera)
  298. Parmelia substygia Räs. - Thomson (1984: 317 sub Parmelia substygia)
  299. Parmelia sulcata Tayl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 318)

  300. Parmeliella cyanolepra (Tuck.) Herre - Herre (1917: ), Douglas (1974: 589)
  301. Parmeliella praetermissa (Nyl.) P. James - Howard (1950: ), Douglas (1974: 589)
  302. Parmeliella tryptophylla (Ach.) Müll. - Thomson (1984: 321)

  303. Parmeliopsis ambigua (Wulf.) Nyl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 325)
  304. Parmeliopsis hyperopta (Ach.) Arn. - Herre (1943: ), Douglas (1974: 589), Thomson (1984: 326)

  305. Peltigera aphthosa (L.) Willd. - Herre (1917: ), Thomson (1950: ), Howard (1950: ), Eyerdam (1960: ), Douglas (1974: 589), Thomson (1984: 329)
  306. Peltigera aphthosa var. leucophlebia Nyl. - Thomson (1984: 330)
    Peltigera aphthosa var. variolosa - Eyerdam (1960: 109)
  307. Peltigera canina (L.) Willd. - Herre (1917: ), Howard (1950: ), Douglas (1974: 589)
  308. Peltigera canina (L.) Willd. f. sorediata Schaer. - Thomson (1984: 332)
  309. Peltigera canina (L.) Willd. var. rufescesns (Weis.) Mudd - Thomson (1984: 333)
    Peltigera canina f. leucorrhiza Flörke - Eyerdam (1960: 109)
  310. Peltigera collina (Ach.) Schrad. - Thomson (1950: ), Douglas (1974: 589), Thomson (1984: 334)
  311. Peltigera horizontalis (Huds.) Baumg. - Thomson (1984: 337)
  312. Peltigera lepidophora (Nyl.) Vain. - Imshaug (1950: ), Douglas (1974: 589), Thomson (1984: 338)
  313. Peltigera malacea (Ach.) Funck. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 339)
  314. Peltigera membranacea (Ach.) Nyl. - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 340)
  315. Peltigera polydactyla (Neck.) Hoffm. - Herre (1917: ), Thomson (1950: ), Imshaug (1957: ), Douglas (1974: 589), Thomson (1984: 343)
  316. Peltigera scabrosa Th. Fr. - Thomson (1984: 344)
  317. Peltigera spuria - Herre (1917: ), Thomson (1950: ), Douglas (1974: 589)
  318. Peltigera venosa (L.) Baumg. - Herre (1917: ), Howard (1950), Douglas (1974: 589), Thomson (1984: 345)

  319. Pertusaria amara (Ach.) Nyl. - Herre (1917: ), Douglas (1974: 589)
  320. Pertusaria carneopallida (Nyl.) Anzi ex Nyl. - Thomson (1997: 451)
  321. Pertusaria glaucomela (Tuck.) Nyl. - Douglas (1974: 589)
  322. Pertusaria leioplaca (Ach.) DC. - Herre (1917: ), Douglas (1974: 589)
  323. Pertusaria multipuncta (Turn.) Nyl. - Herre (1917: ), Douglas (1974: 589)
  324. Pertusaria pertusa (L.) Tuck. - Herre (1917: ), Douglas (1974: 589)
    Pertusaria pocillum - Eyerdam (1960: 109)
  325. Pertusaria sommerfeltii (Flörke ex Sommerf.) Fr. - Thomson (1997: 461)

  326. Phaeophyscia endococcinea (Körb.) Moberg - Thomson (1984: 348)
  327. Phaeophyscia sciastra (Ach.) Moberg - Thomson (1984: 349)

  328. Physcia adscendens (Fr.) Oliv. - Thomson (1984: 352)
  329. Physcia aipolia (Humb.) Fürnrohr - Herre (1917: ), Thomson (1963), Douglas (1974: 589), Thomson (1984: 353)
  330. Physcia caesia (Hoffm.) Fürnrohr - Howard (1950: ), Douglas (1974: 589), Thomson (1984: 354)
  331. Physcia cascadensis H. Magn. - Thomson (1963: ), Douglas (1974: 590)
  332. Physcia dubia (Hoffm.) Lettau - Imshaug (1957: ), Thomson (1963: ), Douglas (1974: 590), Thomson (1984: 355)
  333. Physcia phaea (Tuck.) Thoms. - Thomson (1984: 356)
  334. Physcia stellaris (L.) Nyl. - Howard (1950: ), Douglas (1974: 590)
    Physcia tenella - Eyerdam (1960: 109)
  335. Physcia teretiuscula (Ach.) Lynge - Imshaug (1957: ), Thomson (1963: ), Douglas (1974: 590)
  336. Physcia tribacea (Ach.) Nyl. - Howard (1950: ), Douglas (1974: 590)

  337. Physconia detersa (Nyl.) Poelt - Thomson (1984: 359)
  338. Physconia muscigena (Ach.) Poelt - Imshaug (1957: ), Thomson (1963: ), Douglas (1974: 590), Thomson (1984: 360)
  339. Physconia pulverulenta (Schreb.) Poelt - Herre (1917: ), Howard (1950: ), Douglas (1974: 590)

  340. Pilophoron acicularis (Ach.) Nyl. - Eyerdam (1960: 109), Douglas (1974: 590)
  341. Pilophoron cereolus (Ach.) Th. Fr. - Herre (1917: ), Howard (1950: ), Howard (1955: ), Douglas (1974: 590)
  342. Pilophoron clavatu Th. Fr. - Herre (1917: ), Douglas (1974: 590)

  343. Placopsis gelida (L.) Lindsay - Thomson (1997: 472)

  344. Placynthiella uliginosa (Schrad.) Coppins & James - Thomson (1997: 475)

  345. Platismatia glauca (L.) W. Culb. & C. Culb. - Herre (1917: ), Howard (1950: ), Howard (1955), Douglas (1974: 590), Thomson (1984: 368)
  346. Platismatia herrei (Imshaug) W. Culb. & C. Culb. - Herre (1917: ), Howard (1950: ), Culberson & Culberson (1968: ), Douglas (1974: 590)
  347. Platismatia lacunosa (Ach.) W. Culb. & C. Culb. - Herre (1917: ), Douglas (1974: 590)
  348. Platismatia norvegica (Lynge) W. Culb. & C. Culb. - Douglas (1974: 590), Thell et al. (1998: 309) DNA: ITS
  349. Platismatia stenophylla xxx - Thell et al. (1998: 309) DNA: ITS

  350. Placopsis gelida (L.) Linds. - Herre (1917: ), Douglas (1974: 590)

  351. Pleopsidium chlorophanum (Wahlenb. ex Ach.) - Douglas (1974: 584 sub Acarospora chlorophana)

  352. Polychidium muscicola (Sw.) Gray - Thomson (1984: 370)

  353. Polysporina simplex (Davis) Vezda - Thomson (1997: 486)

  354. Porpidia albocaerulescens (Wulf.) Ach. - Howard (1950: as Lecidea albocaerulescens), Douglas (1974: 587 as Lecidea albocaerulescens)
  355. Porpidia crustulata (Ach.) xxx - Douglas (1974: 587 as Lecidea crustulata)

  356. Porpidia grisea Gowan - Thomson (1997: 493)
  357. Porpidia macrocarpa (DC.) Steud. - Eyerdam (1960: as Lecidea macrocarpa), Douglas (1974: 588 as Lecidea macrocarpa)
  358. Porpidia speirea (Ach.) Kremp. - Herre (1943: ), Douglas (1974: 588 as Lecidea speirea), Thomson (1997: 497)
  359. Porpidia thomsonii Gowan - Thomson (1997: 498)

  360. Protothelenella sphinctrinoides (Nyl.) Mayrh. & Poelt - Thomson (1997: 505)

  361. Pseudephebe minuscula (Nyl. ex Arnold) Brodo & D. Hawksw. - Douglas (1974: 584 sub Alectoria minuscula), Thomson (1984: 373)
  362. Pseudephebe pubescens (L.) M. Choisy - Douglas (1974: 584 sub Alectoria pubescens), Thomson (1984: 374)

  363. Pseudocyphellaria anthraspis (Ach.) H. Magn. - Herre (1917: ), Douglas (1974: 590)
  364. Pseudocyphellaria perpetua McCune & Miadlikowska - Geiser et al. (2004: 107)

  365. Psora globifera (Ach.) A. Massal. - Thomson (1997: 508)
  366. Psora lurida(Ach.) DC. - Thomson (1997: 509)
  367. Psora nipponica (Zahlbr.) Schneider - Thomson (1997: 510)

  368. Psoroma hypnorum (Vahl) Gray - Douglas (1974: 590), Thomson (1984: 375)

  369. Pyrrhospora gowardiana Spribille & Hauck - Spribille & Hauck (2003: 560)
  370. Pyrrhospora quernea (Dickson) Körb. - Geiser et al. (2004: 108)
  371. Ramalina farinacea (L.) Ach. - Douglas (1974: 590)
  372. Ramalina geniculata Hook. f. & Tayl. - Howard (1955), Douglas (1974: 590)
  373. Ramalina inflata Hook. f. & Tayl. - Herre (1917:), Douglas (1974: 590)
    Ramalina leptocarpha var. sorediata - Eyerdam (1960: 109)
  374. Ramalina pollinaria (Westr.) Ach. - Geiser et al. (2004: 109)
  375. Rhizocarpon badioatrum (Flörke ex Sprengel) Th. Fr. - Thomson (1997: 524)
  376. Rhizocarpon bolanderi (Tuck.) Herre - Thomson (1997: 526)
  377. Rhizocarpon cinereovirens (Müll. Arg.) Vain. - Thomson (1997: 528)
  378. Rhizocarpon concentricum (Davis) Beltram. - Thomson (1997: 529)
  379. Rhizocarpon copelandii (Körb.) Th. Fr. - Thomson (1997: 531)
  380. Rhizocarpon disporum (Naeg. ex Hepp) Müll. Arg. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590)
  381. Rhizocarpon distinctum Th. Fr. - Herre (1943: ), Douglas (1974: 590)
  382. Rhizocarpon geminatum Körb. - Thomson (1997: 537)
  383. Rhizocarpon geographicum (L.) DC. - Douglas (1974: 590), Thomson (1997: 538)
  384. Rhizocarpon grande (Flörke ex Flotow) Arnold - Thomson (1997: 539)
  385. Rhizocarpon hochstetteri (Körb.) Vain. - Herre (1943: ), Douglas (1974: 590), Thomson (1997: 540)
  386. Rhizocarpon jemtlandicum Malme - Douglas (1974: 590), Thomson (1997: 542)
  387. Rhizocarpon macrosporum Räsänen - Douglas (1974: 590), Thomson (1997: 543)
  388. Rhizocarpon obscuratum (Ach.) A. Massal. - Douglas (1974: 590), Thomson (1997: 545)
  389. Rhizocarpon polycarpum (Hepp) Th. Fr. - Thomson (1997: 546)
  390. Rhizocarpon riparium Räsänen - Thomson (1997: 548)

  391. Rhizoplaca chrysoleuca (Sm.) Zopf - Douglas (1974: 587 as Lecanora chrysoleuca), Thomson (1997: 554)
  392. Rhizoplaca melanophthalma (Ramond) Leuck. & Poelt - Douglas (1974: 587 as Lecanora melanophthalma), Thomson (1997: 555)
  393. Rhizoplaca peltata (Ramond) Leuck. & Poelt - Thomson (1997: 555)

  394. Rinodina conradii Körb. - Thomson (1997: 563)
  395. Rinodina exigua (Ach.) S. Gray - Herre (1917: ), Douglas (1974: 590)
  396. Rinodina hallii Tuck. - Herre (1917: ), Douglas (1974: 590)
  397. Rinodina mniaraea (Ach.) Körb. - Douglas (1974: 590), Thomson (1997: 567)
    Rinodina novomexicana B. de Lesd. - Eyerdam (1960: 109)
  398. Rinodina turfacea (Wahlenb.) Körb. - Herre (1917: ), Douglas (1974: 590), Thomson (1997: 571)

  399. Sagiolechia rhexoblephara (Nyl.) Zahlbr. - Thomson (1997: 575)

  400. Sarcogyne bicolor H. Magn. - Eyerdam (1960: 109), Douglas (1974: 590)
  401. Sarcogyne simplex (Dav.) Nyl. - Howard (1950: ), Douglas (1974: 590)

  402. Scoliciosporum umbrinum (Ach.) Arnold - Thomson (1997: 585)

  403. Solorina crocea (L.) Ach. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590), Thomson (1984: 387)
  404. Solorina saccata (L.) Ach. - Herre (1943: ), Douglas (1974: 590)

  405. Sphaerophorus fragilis (L.) Pers. - Eyerdam (1960: 109), Douglas (1974: 590), Thomson (1984: 392)
  406. Sphaeophorus globosus (Huds.) Vain. - Herre (1917: ), Howard (1950: ), Douglas (1974: 590)

  407. Sporastatia testudinea (Ach.) A. Massal. - Howard (1950: ), Douglas (1974: 590), Thomson (1997: 589)

  408. Staurothele areolata (Ach.) Lettau - Thomson (1997: 592)
  409. Staurothele clopima (Wahlenb. ex Ach.) Th. Fr. - Howard (1950: ), Douglas (1974: 590)
  410. Staurothele drummondii (Tuck.) Tuck. - Thomson (1997: 595)
  411. Staurothele fissa (Tayler) Zwackh. - Thomson (1997: 596)
  412. Staurothele glacialis Herre - Herre (1943: ), Douglas (1974: 591) Typus ???
  413. Staurothele perradiata Lynge - Douglas (1974: 591)

  414. Stereocaulon albicans Th. Gr. - Douglas (1974: 591)
  415. Stereocaulon alpinum Laur. - Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 400)
  416. Stereocaulon condensatum Hoffm. - Douglas (1974: 591)
  417. Stereocaulon depreaultii Del. - Imshaug (1957: ), Douglas (1974: 591)
  418. Stereocaulon glareosum (Sav.) H. Magn. - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 412)
  419. Stereocaulon grande (Magn.) H. Magn. - Thomson (1984: 413)
  420. Stereocaulon intermedium (Sav.) H. Magn. - Douglas (1974: 591), Thomson (1984: 417)
  421. Stereocaulon paschale (L.) Hoffm. - Herre (1917: ), Douglas (1974: 591), Thomson (1984: 418)
  422. Stereocaulon rivulorum H. Magn. - Douglas (1974: 591), Thomson (1984: 421)
  423. Stereocaulon saxatile H. Magn. - Thomson (1984: 423)
  424. Stereocaulon subalbicans Lamb. - Imshaug (1957: ), Douglas (1974: 591)
  425. Stereocaulon tomentosum E. Fries - Howard (1950: ), Douglas (1974: 591), Thomson (1984: 428)
  426. Stereocaulon vesuvianum Pers. - Howard (1950: ), Douglas (1974: 591)

  427. Sticta weigelii (Isert ex Ach.) Vain. - Douglas (1974: 591), Thomson (1984: 434)

  428. Strangospora moriformis (Ach.) Stein - Thomson (1997: 599)

  429. Tephromela armeniaca (DC. in Lam. & DC.) Hertel & Rambold - Thomson (1997: 60)
  430. Tephromela atra (Huds.) Hafellner - Thomson (1997: 633)

  431. Thamnolia subuliformis (Ehrh.) Culb. - Douglas (1974: 591), Thomson (1984: 438)
  432. Thamnolia vermicularis (Sw.) Ach. - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 438)

  433. Thelotrema lepadinum (Ach.) Ach. - Herre (1917: ), Douglas (1974: 591)

  434. Tholurna dissimilis (Norm.) Norm. - Otto (1972: ), Douglas (1974: 591)

  435. Toninia aromatica (Turner ex Sm.) A. Massal. - Herre (1943: ), Douglas (1974: 591), Thomson (1997: 613)
  436. Toninia lobulata (Sommerf.) Lynge - Thomson (1997: 617)
  437. Toninia ruginosa (Tuck.) Herre - Howard (1950: ), Douglas (1974: 591)
  438. Toninia squalida (Schleicher ex Ach.) A. Massal. - Howard (1950: ), Douglas (1974: 591), Thomson (1997: 619)

  439. Trapelia coarctata (Turner ex Sm. & Sow.) M. Choisy - Eyerdam (1960: ), Douglas (1974: 591), Thomson (1997: 621)

  440. Trapeliopsis granulosa (Hoffm.) Lumbsch - Thomson (1997: 624)

  441. Umbilicaria angulata Tuck. - Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 442)
  442. Umbilicaria arctica (Ach.) Nyl. - Thomson (1984: 444)
  443. Umbilicaria cylindrica (L.) Del. in Duby - Herre (1917: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 448)
  444. Umbilicaria deusta (L.) Baumg. - Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 449)
  445. Umbilicaria havaasii Llano - Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 451)
  446. Umbilicaria hyperborea (Ach.) Hoffm. - Herre (1957: ), Llano (1950: ), Howard (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 453)
  447. Umbilicaria lambii Imshaug - Imshaug (1957: ) Typus ???
  448. Umbilicaria phaea Tuck. - Llano (1950: ), Douglas (1974: 591), Thomson (1984: 455)
  449. Umbilicaria polyphylla (L.) Baumg. - Thomson (1984: 457)
  450. Umbilicaria polyrrhiza (L.) Fr. - Thomson (1984: 27 as Actinogyra polyrrhiza)

  451. Umbilicaria proboscidea (L.) Schrad. - Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 458)
  452. Umbilicaria torrefacta (Lightf.) Schrad. - Herre (1917: ), Llano (1950: ), Imshaug (1957: ), Douglas (1974: 591), Thomson (1984: 459)
  453. Umbilicaria vellea (L.) Ach. - Herre (1943: ), Llano (1950: ), Howard (1950: ), Douglas (1974: 591), Thomson (1984: 460)

    Usnea capillaris Mot. - Eyerdam (1960: 109)

  454. Usnea cavernosa Tuck. - Thomson (1984: 463)
    Usnea comosa (Ach.) Röhl - Eyerdam (1960: 109)
    Usnea compacta Mot. - Eyerdam (1960: 109)
  455. Usnea dasypoga (Ach.) Röhl. - Eyerdam (1960: 109 as Usnea dasypoga var. emena), Thomson (1984: 465)
  456. Usnea florida (L.) Wigg. - Herre (1917: ), Douglas (1974: 591)
    Usnea glabrata - Eyerdam (1960: 109)
  457. Usnea glabrescens (Nyl. ex Vain.) Vain. - Eyerdam (1960: 109), Douglas (1974: 591)
  458. Usnea hesperina Mot. - Geiser et al. (2004: 108)
  459. Usnea hirta (L.) F. H. Wigg. - Herre (1917: ), Howard (1955: ), Douglas (1974: 591), Thomson (1984: 467)
  460. Usnea longissima Ach. - Douglas (1974: 591)
    Usnea mollis - Eyerdam (1960: 109)
  461. Usnea plicata (L.) Wigg. - Herre (1917: ), Douglas (1974: 591) Misidentification according to Hale and Culberson (1970) see Douglas
  462. Usnea scabrata Nyl. subsp. nylanderiana Motyka - Thomson (1984: 468)
    Usnea sorediifera - Eyerdam (1960: 110)
    Usnea stuppea - Eyerdam (1960: 110)
  463. Usnea subfloridana Stirt. - Thomson (1984: 469)
  464. Usnea substerilis Motyka - Thomson (1984: 470)
  465. Usnea trichodea Ach. - Eyerdam (1960: 110), Douglas (1974: 591)

  466. Verrucaria acrotella Ach. - Douglas (1974: 591)
  467. Verrucaria ceuthocarpa Wahlenb. - Thomson (1997: 635)
  468. Verrucaria hydrela Ach. - Eyerdam (1960: 110), Douglas (1974: 591)
  469. Verrucaria margacea (Wahlenb. in Ach.) Wahlenb. - Thomson (1997: 639)
  470. Verrucaria maura Wahlenb. - Thomson (1997: 640)
  471. Verrucaria mucosa Wahlenb. - Eyerdam (1960: 110), Thomson (1997: 641)
  472. Verrucaria nigrescens Pers. - Herre (1917: ), Douglas (1974: 591)
  473. Verrucaria striatula Wahlenb. - Thomson (1997: 645)

  474. Vulpicida tilesii (Ach.) J.-E. Mattsson & M. J. Lai - Glew (1994: 83)

  475. Xanthomendoza fallax (Hepp in Arnold) xxx - Eyerdam (1960: 110 as Xanthoria fallax), Thomson (1984: 486 as Xanthoria fallax)

  476. Xanthoparmelia conspersa (Ach.) xxx - Howard (1950: ), Douglas (1974: 589 as Parmelia conspersa)
  477. Xanthoparmelia taractica (Kremp.) Hale - Thomson (1984: 480)

  478. Xanthoria candelaria (L.) Arnold - Herre (1943: ), Douglas (1974: 591), Thomson (1984: 483)
    Xanthoria candelaria var. leprosa Hillm. - Eyerdam (1960: 110)
  479. Xanthoria elegans (Link.) Th. Fr. - Herre (1917: ), Howard (1950: ), Douglas (1974: 591), Thomson (1984: 484)
  480. Xanthoria polycarpa (Ehrh.) Rieber - Herre (1917: ), Howard (1950: ), Douglas (1974: 591), Thomson (1984: 487)
  481. Xanthoria sorediata (Vain.) Poelt - Thomson (1984: 487)

  482. Xylographa abietina (Pers.) Zahlbr. - Thomson (1997: 646)
  483. Xylographa vitiligo (Ach.) J. R. Laundon - Thomson (1997: 647)