38S 



THE DEUTEROMYCETES (FUNGI IMPERFECTI) 



body arises by proliferation of a single hyphal cell or of a group 

 of adjacent cells of a single hypha, the species is regarded as 



Fig. 149, Simple meristogenous origin of pvcnidium, A to C, in Phovia 

 herbarimi. (Adapted from Kempton.) Svmphogenous origin of pvcnid- 

 ium, D to F, of Endotbia parasitica. (Adapted from Anderson and Rankin.) 



meristogenous in origin. If the primordium of the fruiting body, 

 on the other hand, arises from the interlacing and anastomosing 

 of hyphal branches from several mycelial threads, which then 

 proliferate to form a stroma, the species is regarded as sym- 

 phogenous. The study by Mercer (1913) of pycnidial morpho- 

 genesis in Fhouia richardiae showed that its primordia are of both 

 types. Similarly, the pycnidia of other species, such as Septoria 



i 



