264 THE LOWER FUNGI— FHYCOMYCETES 



provided by Saccardo (Syll. Fung., 6: 508, 1905) and attributed 

 to him. Blakeslee (1905: 161) further justified the inckision 

 of the species in the Mucorales by discovering its zygospores. 

 Thaxter (1903: 98) pointed out that the species should bear the 

 name C. echinulata Thaxter. The following additional species 

 have been described. 



C. elegans Lcndner [Bid. flerbier Boissier (2 ser.), 5: 250, 1907; also 

 Mucorinees de la Suisse p. 159, 1908]. The genus Actinocephalum Saito, 

 cited above as a synonym of C unninghamella, was based on a single species, 

 A. japonic mti, which is clearly very close to C. elegans. 



C. bertholletiae Stadel (1911). 



C. hlakesleeana Lendner (1928). 



C. mandshurica Saito & Naganishi. Discussed above under Choanephora. 



C. albida (Sacc.) Matruchot (1903: 56). This species, based on Oedo- 

 cephalum alhiduvi Sacc. (Michelia, 2 : 288, and Fungi Italici, fig. 805), and the 

 following based on Gonatobolrys microspora Rivolta were tentatively incor- 

 porated in Cumdnghamella by Matruchot but were not recognized by 

 Saccardo. They may be listed as doubtful. 



C. microspora (Rivolta) Matruchot (1903: 56). 



Another species is mentioned but not named by Blakeslee, 

 Cartledge, and Welch (1921). 



For a discussion of zygospore formation in the genus consult 

 their paper and that of Burger (1919). 



The genera Sigmoideotmjces Thaxter (1891: 22) and Thatnno- 

 cephalis Blakeslee (1905: 165), known only in their conidial 

 stages, may be listed as doubtful members of the order, but in 

 the absence of zygospores cannot be certainly included. If 

 incorporated they would fall somewhere in the general vicinity 

 of C unninghamella. 



Mortierellaceae 



Multispored sporangium present in some forms, lacking in 

 others, when present lacking a columella; sporangiola and conidia 

 formed in some genera, when present isolated, not covering an 

 enlargement on the sporangiophore or conidiophore; zygospore 

 where known enveloped in a thick layer of interwoven hyphae. 



Key to Genera of Mortierellaceae 



I. Sporangium present, sometimes accompaiiitHl by conidia. 



A. Sporangiophore :irising directly from the ordinary mycelial 

 liyphae. 



1. Sporangiophore erect, usually tapering to a delicate, hair-like 

 tip lieneath the sporangium, more or less swollen toward 



I 



