24 



LICHEN FLORA OF THE UNITED STATES 



47. Arthonia 



49. Xylographa 



50. Opegrapha 



51. Opegraphoidea 



58. Glyphis 



59. Sarcographa 



65. Dendrographa 



68. Lecanactis 



71. Ocellularia 



72. Phaeotrema 



76. Conotrema 



79. Microphiale 



80. Gyalecta 



84. Coenogonium 



86. Thermutis 



87. Zahlbrucknerella 



88. Spilonema 



93. Pyrenopsis 



94. Synalissa 



99. Pterygium 



101. Lempholemma 



102. Synechoblastus 



106. Heppia 



108. Hydrothyria 



109. Massalongia 



110. Placynthium 



Order Hysteriales 



Family 14. Arthoniaceae 



48. Arthothelium 



Family IS. Graphidaceae 



52. Melaspilea 



53. Graphis 



54. Phaeographis 



Family 16. Chiodectonaceae 



60. Medusulina 



61. Chiodecton 



Family 17. Dirinaceae 

 64. Dirina 



Family 18. Roccellaceae 

 66. Roccella 



Order Lecanorales 

 Family 19. Lecanactidaceae 



69. Schismatomma 

 Family 20. Thelotremaceae 



IS. Thelotrema 



74. Leptotrema 



Family 21. Diploschistaceae 



77. Urceolaria 

 Family 22. Ectolechiaceae 

 78. Lopadiopsis 

 Family 23. Gyalectaceae 



81. Secoliga 



82. Ramonia 



Family 24. Coenogoniaceae 

 85. Racodium 

 Family 25. Ephebaceae 



89. Ephebe 



90. Leptogidium 



91. Polychidium 



Family 26. Pyrenopsidaceae 



95. Psorotichia 



96. Forssellia 



Family 27. Lichinaceae 



100. Lichina 

 Family 28. Collemaceae 



103. Collema 



104. Collemodes 



Family 29. Heppiaceae 

 107. Solorinaria 



Family 30. Pannariaceae 



111. Parmeliella 



112. Pannaria 



113. Psoroma 



55. Graphina 



56. Phaeographina 



57. Helminthocarpon 



62. Sclerophyton 



63. Enterostigma 



67. Schizopelte 



70. Platygraphopsis 

 75. Gyrostomum 



83. Pachyphiale 



92. Porocyphus 



97. Thyrea 



98. Peccania 



105. Leptogium 



114. Coccocarpia 



