244 THE LOWER FUNGI— PHYCOMYCETES 



except in the shape of the sporangium and columella, and may 

 represent merely an atypical member of that genus. 



2. Circinella van Tieghem & le Monnier (1873: 298). 

 Sporangiophore elongating indefinitely, not bearing a terminal 



sporangium, branching in a cymose manner; the branches 

 circinate, single or in groups, terminated by globose sporangia; 

 sporangial wall persistent, incrusted with crystals of calcium 

 oxalate, finally rupturing in such a manner as to leave a promi- 

 nent collar at the base around the columella; columella large, 

 cylindrical to conical. 



Lendner (1908 h: 101) includes seven species in the genus, and 

 others have been described since {Saccardo Syll. Fung., 24 : 1926). 

 In C. iimbellata zygospores are described by Bainier (1903: 170). 



3. Absidia van Tieghem (1876: 350). 



Mycelium forming repeatedly branched, arching stolons, 

 rooted at points of contact with the substratum; sporangiophores 



Fig. 81. — Absidia glauca Hagem. Zygospore with circinate outgrowths arising 

 from the suspensors. {After Lendner 190S.) 



erect, straight, usually in fascicles, more rarely single, arising 

 from the elevated arching internodes of the stolons, not opposite 

 the rhizoids; sporangia terminal, pyriform; sporangial wall 



