ASCOMYCETES 



377 



He will find there also more information on the development of 

 the sporocarps (both discocarpous and pyrenocarpous) of the types 



Fig. -ijW.— Claviceps p7irpurca Tul. A, sclerote which has produced seven stromata. B, 

 upper portion of a stroma in longitudinal section, i^, peritheces. C, longitudinal section 

 of perithece. cp, ostiole ; sh, cortical tissue ; hy, inner tissue of stroma. D, ascus isolated. 

 sp, ascospores issuing. (^, natural size, B slightly, C and D highly magnified.) (After 

 Tulasne.) 



quoted than it is possible to give in this place without burdening the 

 section beyond proportion with matter of no striking morphological 

 significance. 



Homologies of the Organs. 



De Bary, the founder of the system of classification of fungi adopted 

 in the present book, calls attention to the striking parallelism between 

 Ascomycetous forms on the one hand and the Mucorini, Peronosporeas, 

 and Saprolegnieae on the other. From the oosperms and the spores of 

 the sporocarps there arises a thallus which closes its development \s\\.\\ 

 the formation of sexual organs and the oosperm and sporocarp resulting 

 from their union. In many cases the life-history is confined to this ; 

 for example, from the Phycomycetes, Pythium vexans, &c. ; from the 



