PHYCOMYCETES 41 



free; its wall formed directly from that of the sametan- 

 gium; swarmspores absent in the trroup. — ^Zygomycetes. 

 a. Forms typically saprophytic; zygospores borne chiefly 

 on aerial mycehum; asexual reproductive cells 

 extremely various and representing steps in the 

 evolution of the unicellular deciduous conidium from 

 the many-spored persistent sporangium; conidia not 

 shot away. 



7. Mucorales, p. 234 



6. Forms chiefly parasitic and entomogenous, a few forms 

 saprophytic, a few oth rs parasitic on plants; zygo- 

 spores borne typically within the host; asexual repro- 

 duction almost always by conidia borne at the ends of 

 specialized conidiophores and shot away at maturity. 



8. Entomophthorales, p. 281 



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