Seaver : Some North Dakota Hypocreales 531 



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

 currants in cultivation. In external appearance the plants of this 

 spec.es very closely resemble those of Nectria 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. Hypomyces 



Hypomyces aurantius (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 

 •"after common. 



Hypomyces lactifluorum (Schwein.) Tul. 



Hypomyces purpureus Peck. 

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

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

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

 aCe are tne perithecia, which are nearly immersed, with necks pro- 

 g- As the plants of the host decay, they become purple, 

 ~ ac counts for the specific name of the synonym given above. 



e species was found to be abundant in one locality. 

 ^ Hypomyces ochraceus (Pers.) Tul. On some agaric in same 

 ocality as preceding. The plants differ from the preceding by 

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

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



In 4-L _ 



trudin 



spores. 



colo 



vpomyces polyporinus Peck. On old plants of Coriolusversi- 

 > n woods near Fargo. The plants of this species occur on the 

 surface of the host and would scarcely be seen except by 

 th en . ° r s P ecia * search. Characterized by the amber color of 



perithecia and the habitat as well as by spore characters. 

 ^ J n considerable abundance. I am indebted to Professor 



ec k for an authentic specimen of this species for comparison. 



lecti YP ° MYCES r °sellus (Albert. & Schwein.) Tul. Several col- 

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



