Seaver : Some North Dakota Hvpocreales 531 



of wild black currant in woods near Fargo. Very destructive to 

 currants in cultivation. In external appearance the plants of this 

 species very closely resemble those of Ncctria purpurea (L.) W. 

 & S. but the species is very distinct in the spore characters. The 

 spores instead of being 2-celled are divided both longitudinally 

 and transversely into numerous cells. 



IV. Hypomvces 



Hypomvces aukantius (Pers.) Fuckel. On decaying fungi of 

 various kinds. Various collections, Fargo and Hawk's Nest. 

 The fungus presents to the naked eye a rusty red appearance due 

 to the cottony stroma, which spreads over the substratum often 

 for several inches. Closer examination will show the orange- 

 colored perithecia scattered over the stroma. The species is 

 rather common. 



Hvpomvces LACTiFLUORUM (Schwcin.) Tul. 

 Hyponiyces pitrpurcus Peck. 



On some agaric in woods near Fargo. The stroma of this 

 plant, which entirely covers the hymenium of the host infected, 

 presents an orange-yellow color. Scattered over the orange sur- 

 face are the perithecia, which are nearly immersed, with necks pro- 

 truding. As the plants of the host decay, they become purple, 

 which accounts for the specific name of the synonym given above. 

 The species was found to be abundant in one locality. 



Hypomvces ochraceus (Pers.) Tul. On some agaric in same 

 locality as preceding. The plants differ from the preceding by 

 the fact that the stroma is almost entirely white when fresh, be- 

 coming yellowish as it dries. There is also a marked difference 

 in the spores. 



Hypomyces polyporinus Peck. On old plants of Coriolus versi- 

 color, in woods near Fargo. The plants of this species occur on the 

 under surface of the host and would scarcely be seen except by 

 accident or special search. Characterized by the amber color of 

 the perithecia and the habitat as well as by spore characters. 

 Found in considerable abundance. I am indebted to Professor 

 C. H. Peck for an authentic specimen of this species for comparison. 



Hypomyces rosellus (Albert. & Schwein.) Tul. Several col- 

 lections on the under side of rotten logs in woods near Fargo. 



