20 Charles E. Bessey 



Family 68. Astrotheliaceae. Crustaceous lichens with Tren- 

 tepohlia gonidia ; perithecia clustered more or less radially. As- 

 trotheUnrn, Parmentaria. (Pf. I, i*, ^2.) 



Family 69. Strigulaceae. Crustaceous lichens with Cephalen- 

 ros or PhyUactidium gonidia; perithecia single, erect. Phyllo- 

 porinia, Strigula. (Pf. I, i*, 74-) 



Family 70. Pyrenidiaceae. Crustaceous to scaly, and folia- 

 ceous lichens with Kostoc, Scytonema, or Sirosiphon gonidia; 

 perithecia single, erect. Pyrenidium. (Pf. I, i*, 76.) 



Family 71. Mycoporaceae. Crustaceous lichens with Palmella 

 or Trentcpohlia gonidia ; perithecia flattened, more or less subdi- 

 vided. Mycoponim. (Pf. I, i*, yy.) 



Order Pyrexomycetales. Closed Fungi ; " Black Fungi." 

 Plants filamentous, often compacted into a hard cellular mass, 

 the stroma, in the surface of which the spheroidal, simple or 

 mostly compound perithecia are partially embedded. 



Family 72. Hypocreaceae. Simple or compound ; perithecia 

 mostly reddish or yellowish, subcarnose or waxy-membranaceous. 

 Nectria, Epichloe. Cordyccps, Claviccps. (Pf. I, i, 342.) 



Family y^,. Dothideaceae. Compound ; perithecia black, cori- 

 aceous or carbonaceous, confluent with the stroma. Plowrightia, 

 Dothidea, Phyllachora. (Pf. I, i, 373). 



Family 74. Sordariaceae. Simple ; perithecia soft, brown or 

 black, with or without a stroma ; mostly coprophilous. Sordaria, 

 Sporormia. (Pf. I, i, 390.) 



Family 75. Chaetomiaceae. Simple; perithecia superficial, 

 free, brown, and fragile, generally bristly, on a superficial myce- 

 lium. Chaetominm. (Pf. I, i. 387.) 



Family 76. Sphaeriaceae. Simple ; perithecia superficial, free, 

 or more or less sunken in the stroma, globular or flattish. Tricho- 

 spJiacria, Lasiosphacria, Rosell'mia. (Pf. I, i, 394.) 



Family yy. Ceratostomataceae. Simple; the perithecia more 

 or less prolonged into a tubular ostiole. Ceratostomella. Cerat- 

 ostoma. (Pf. I, I, 405.) 



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