112 



Mycologia 



21. MOLLISIA 



Mollisia cinerea (Batsch) Karst. Plants small or medium, 

 saucer-shaped, with a light-colored border. Common on wood 

 and decaying herbaceous stems. Collected commonly about 

 Fargo. ^ The specimens occurring on herbaceous stems may be 

 distinct from those on wood but we can see no difference. 



Mollisia Dehnii. Rabenh. On living leaves and stems of 

 Potentilla sp. The plants, when they occur, almost entirely 

 cover the leaves and stems of the host. They are small and 

 disc-shaped and of a rather dark color. Collected at Fargo in 

 the Agricultural College grounds. 



22. PSEUDOPEZIZA 



Pseudopeziza Medicaginis (Lib.) Sacc. Forming minute 

 brown leaf-spots on the living leaves of the host and causing 

 much damage to the crop. Collected commonly at Fargo in the 

 Agricultural College grounds, on leaves of alfalfa. 



23. Karschia 



Karschia taveliana Rehm. Forming small black discs, often 

 in considerable numbers, on partially decayed wood. Collected 

 about Fargo on logs of decaying ash. 



Karschia lignyota (Fries) Sacc. Similar to the preceding 

 but smaller and spores also different. Collected on old wood 

 at Hawk's Nest. 



24. Bactrospora 



Bactrospora dryina (Ach.) Mass. The genus is represented 

 by a single species, and no previous record of it has been seen 

 from North America. Specimens collected on dead branches of 

 Symphoricarpus occidentalism by J. F. Brenckle, at Kulm, N. D. 



25. Patellaria 



Patellaria atrata (Hedw.) Fries. Plants similar in ex- 

 ternal appearance to those of the preceding genus but very 

 different internally. Spores much larger, colorless and many- 

 septate. Substance with transmitted light bluish. Hawk's Nest. 



