102 MINNESOTA BOTANICAL STUDIES. 



Subfamily 2. MORTIERELLEAE. 



Fertile mycelium distinct from the vegetative; sporangia 

 without a columella; zygospores enclosed in a thick mass of 

 hyphae growing out from the suspensors and the branches 

 from which they arise. 



This group appears to be connected with the Rhizopeae, 

 having a distinct, well developed fertile mycelium. In Absidia 

 in the latter group we have the beginnings of the thick cover- 

 ing of the zygospore by outgrowths from the suspensors. 



11. MORTIERELLA Coemans. Bull. Acad. Belg. ii, 15: 

 536. 1863. 



Fertile mycelium growing over the substratum and extending 

 to other substances, richly branched with thin, stolon-like 

 branches, which by fusion with neighboring hyphae form a net 

 work, when old forming septa; sporangiophores single or in 

 tufts, swollen at the base, with or without lobed rhizoids, sim- 

 ple or branched, all branches terminating in sporangia. 

 Round, echinulate stylospores are produced on the fertile 

 mycelium. Chlamydospores are produced in the substratum. 



Mortierella polycepUala Coemans 1. c. 



Sporangiophores in groups of 5-20, erect, without septa, with 

 or without short lobed rhizoids, swollen at the base, tapering 

 strongly, above filiform, terminating in a large sporangium, 

 on the upper portion bearing 2-10 short, simple, single or ver- 

 ticillate side branches, terminating in small sporangia; spor- 

 angia round, white, 4-20 spored, with a very small basal collar; 

 spores round or ovate, colorless, differing in size, commonly 

 10-12 mikrons, with a large glistening oil drop. 



On dung, decaying fungi, etc. Reported from Boston by Dr. 

 W. G. Farloiv. 



12. HERPOCLADIUM Schroeter. Krypt. Flor. v. Schles. 

 III. 1:213. 1886. 



Sporangiophores not terminating in sporangia, sympodially 

 branched, bearing sporangia on curved or spirally curled side 

 branches. The only species, H. circinans Schroet., is known 

 only from the author's description. 



{Carnoya Dewevre, Grevillea September J 893, is not yet fully 

 described, and little can be gathered from the meager data 

 given in his synopsis.] 



