PLECTASCALES 



427 



copulation branch, generally simultaneously, althougli occasionally the an- 

 theridium appears somewhat earlier. The ascogonium coils helically, and the 

 terminal cells of the antheridium and ascogonium fuse. The male nucleus 



Fig. 72. — Gymnoascus setosus (Eidamella spinosa). 1, S, chains of arthrospores ; 3, i, 

 stages in copulation ; 5, perldlum, showing ornamentation of spines ; 6, ascus with ascospores ; 

 7, chlamydospores. (After Matruchot & Dassonville 1901.) 



Fig. 73. — 1 and S, Gymnoascus gypseus. 1, section showing perithecial ornamentation 

 above, and asci below; 2, mature asci. (After Nannizzi 1926.) S, Ctenomyces seii'atua; sec- 

 tion of conidial stage (X200). (After Eidam 1880.) 



migrates into the ascogonium, which divides by septa into the binucleate (?) 

 cells which develop ascogenous hyphae. From the latter, 8-spored asci develop 



