92 MINNESOTA BOTANICAL STUDIES. 



Sporangiophores always terminating in sporangia Mortierella. 



Sporangiophores ending in sterile points. Herpocladium. 



[Not yet sufficiently characterized]. Carnoya. 

 Sporangia represented by conidia,— either singly 

 or in chains. 



Sporangia and conidia both present. Choanephoreae. 



Choanephora. 



Conidia only, — produced singly. Chaetocladieae. 



Chaetocladium. 



Conidia in chains. Cephalideae. 

 Conidiophores septate at maturity, dichoto- 



mously branched. Piptocephalis. 

 Conidiophores not septate, simple or once 



forked. SynceiJhalis. 



Conidiophores corymbosely branched. Syncephalastrum. 



Sub-family 1. MUCOBEAE. 



Asexual spores formed in sporangia; sporangia with a colum- 

 ella (except sporangiola in forms having them). Zygospores 

 naked, or surrounded by loose, simple, or simply branched 

 hyphae. 



Tribe Eumucoreae. 



Mycelium and sporangia typically of one kind. 

 This is the stem group from which all the others appear to 

 be derived. 



1. MUCOR LiNNE. Spec. PI. 2:1185. 1753.* 



Hyclrophora Tode. 1791. 



Pleurocystis Bonokden. 1851. 



Circinella Van Tieghem and LeMonier. 1872. 



Pirella Bainier. 1881. 



Chlamydoniiicor Brefeld. 1890. 



Saprophytic; mycelium sj)reading in and upon the substratum; 

 sporangiophores simple or branched, but if branched, not 

 dichotomous. Zygospores borne on the mycelium; the sus- 

 pensors without outgrowths. 



This was the name of one of the eleven genera under which 

 Linne in his Genera Plantaruin included all fungi. 



Sub-genus EUMUCOR Schroeter. Krypt. Flor. v. Schlesien, III, 

 1 :203. 1886. 



Sporangiophores erect, always with terminal sporangia. 



* I ha^e taken the starting point of the Rochester rules. 



