MU COR ALES 



273 



to Blakeslea which he regards as a connecting form in a phylo- 

 genetic series embracing Choanephora and Cunninghamella on 

 the one hand and Piptocephalis, Syncephalis, and Syncephalastrum 

 on the other. 



Fig. 100.- — Piptocephalis frcscniana de Bary {a, h) Zygospore formation. 

 (c-/) Steps in the process which results in the formation of chains of sporangio- 

 spores. ((?) Mycelium attached to host hypha and sending rhizoids into it. 

 {After Brefeld 1872.) 



3. Syncephalastrum Schroter (1886: 217). 



Mycehum wide-spreading, abundantly branched; sporangio- 

 phore erect, lacking basal rhizoids, repeatedly branched, each 

 branch apically dilated to form a globose head bearing rod-shaped 

 sporangia on sterigmata; sporangiospores formed simultaneously 

 and assuming the aspect of chains of conidia as in related genera; 

 zygospores unknown (Fig. 101). 



About six or seven species are known. Although the members 

 of the genus are typically saprophytic, a species has been recently 

 described by Vuillemin (1922: 986) as parasitic on Rhizopus. 



4. Syncephalis van Tieghem & le Monnier (1873: 372). 

 Mycelium parasitic on other Mucorales or saprophytic, 



attached to the host hypha by suckers and sending in deHcate 



