Pound: REVISION OF MUCORACEAE. 95 



Miicor subtilissimus Berkeley. Hort. Journ. 3 -.98. 



Reported from North America in the Sylloge Fungorum. Of 

 this and other Berkeleyan species, Fischer says: "The short 

 diagnoses of the author pass for all possible small fungi. I 

 think that no one of these five species is a Mucor, but they all 

 belong to the Hyphomycetes." 



See under Syvigites and Ascophora for other species described 

 from North America. 



Subgenus CIRCINELLA Van Tieghem and Le Monier. 



1872, ut genus. 



Sporangia formed on side branches of a branched sporangio- 

 phore, the branches arched or curved and often produced in 

 regular groups; the main branch continuing and bearing new 

 side branches, but no terminal sporangium. 



No species are reported for this country. 



This group, made a genus by Van Tieghem and Le Monier, 

 and generally so recognized, was reduced to a subgenus by 

 Schroeter in 1886. It is only a further development of the 

 branched sporangiophore, and leads to the fertile mycelium of 

 Ascophora. 



Subgenus PIRELLA Bainier. 1882, ut genus. 



Similar to CircineUa: sporangia pear shaped, columella very 

 large, hour-glass shaped. 



There is but one species, which is not reported for this 

 country. It is closely allied to CircineUa, and is made a sub- 

 genus of Mucor by Schroeter in Engler u. Prantl, Pflanzen- 

 familien. 1893. 



2. PHYCOMYCES Kunze. Mykol. Hefte. 2 : 113. 1823. 



Sporangiophores simple, arising singly, bronze green, 

 strongly metalic, terminated by a large sporangium ; sporangia 

 round, many spored, the membrane dissolving; columella pear 

 shaped. Conjugating branches tong shaped, the suspensors 

 producing dichotomously branched, dark brown projections. 



Phyeomyces nitens (Agardh.) Kunze, 1. c. 



Ulva nitens Agardh. 1817. 

 The characters of the genus: Sporangiophores 7-30 cm. 

 long; sporangia very large, about 1 mm. ; spores ellipsoid 

 16-30x8-15 mikrons. 



