14 BULLETIN DE L'HERBIER BOISSIER. 



Tribus XXXIV. — Xylographien. 



Thallus crustaceus; gonidia palmellacea ; apothecia lirellina. 



80. Lithographa, sporse simplices, hyalinse ; paraphyses connexse. 



81. Xylographa, sporse simplices, hyalinse; paraphyses non connexse. 



82. Encephalographa, sporse transversim divisse, fuscse. 



Tribus XXXV. — Graphiden. 



Thallus crustaceus ; gonidia chroolepoidea ; apothecia lirellina 

 s. ex orbiculari elongata, margine proprio v. obsoleto prsedita; 

 lamina ascophora evoluta. 



* Apothecia in thallo sparsa. 



1° Margo lecanorinus, interior proprius rudimentarius ; 

 loculi sporarum cylmdrici. 



83. Platygrapha, sporse transversim divisa?, hyalinse; paraphyses con- 



nexse. 



2* Margo proprius nigro-opegraphinus; loculi sporarum cylindrici 

 aut e cylindrico parenchymatico-divisi. 



84. Opegrapha, sporse transversim divisas, hyalinae; paraphyses con- 



nexse. 



85. Dictyographa, sporse e transversim diviso parenchymatöse, hyali- 



nse; paraphyses connexse. 



86. Melampylidium ; sporse e transversim diviso parenchyinaticse, 



hyalinse; paraphyses liberse. 



87. Melaspilea, sporse transversim di visse, fuscse. 



3° Margo proprius (etiam non raro thailino-corticatus) ; loculi sporarum 

 lentiformes v. e lentiformi parenchymatoso-divisi. 



88. Graphis, sporse transversim divisse, hyalinse. 



89. Graphina, sporse parenchymaticse, hyalinse. 



90. Phaeographis, sporse transversim divisse, fuscse. 



91. Phaeographina, sporse parenchymaticse, fuscse. 



4* Margo apotheciorum deficiens; loculi sporarum cylindrici v. e cylindrico 

 parenchymatoso-divisi. — Sporse ssepe e hyalino nigrescentes. 



a. Paraphyses undique intricatün connexœ. 



92. Arthonia, sporse transversim divisse (progemmatione). 



93. Arthothelium, sporse parenchymaticse. 



