CLASSIFICATION OF FUNGI 51 



greatly in size and colour. More or less tube-shaped 

 asci are borne within these cups, each ascus containing 

 eight spores. The genus Sclerotinia contains the 

 greatest number of parasitic species. In this genus the 



1 





FIG. 31. Mycosphaerella, gossypina of the cotton. Conidial stage. 



cup or ascocarp arises from a sclerotium or dense mass 

 of hyphae. This sclerotium may be developed on a 

 living host, or it may form later. Among the most 

 important species of this genus are S. libertiana, Fckl., 

 and S. Fuckeliana, De Bary, which attack lettuce, 

 cabbage, and other plants (pp. 130, 234, 236). 



