MU COR ALES 



261 



2. Choanephora Currey (1873: 578). 



syn. Cunninghamia Currey (1873: 334). 

 Both sporangia and conidia present and not infrequently 

 arising from the same myceHum; sporangium terminal and 

 usually pendent on the recurved end of an erect unbranched 

 sporangiophore, provided with a definite columella which tends 

 to be globose, and usually containing a large number of spores, 

 though diminutive few-spored sporangia sometimes occur; 

 sporangiospores usually ovoid to fusiform, but occasionally 



Fig. 93." — Choanephora cucurhitarum (Berk. & Rav.) Thaxter. (a) Young 

 conidiophore with spherical heads on which conidia are just beginning to form. 



(b) Same at later stage ; the heads covered with conidia borne on short sterigmata. 



(c) Single head enlarged, (d) Single "conidium," here shown to be in fact a 

 mono-spored sporangiolum. (e) Conidium of more usual aspect; the outer 

 wall not evident. (/) Sporangium. ((?) Sporangiospores; the lower atypical, 

 (a-e, after Thaxter 1903, 1914; (f-g) after Wolf 1917.) 



varying to inequilateral or triangular, not striate like the conidia, 

 provided at both ends, and in spores of odd shape sometimes also 

 at the side, with a cluster of very fine, radiating appendages as 

 in the related genus Blakeslea; conidiophore an erect hypha 

 terminated in a capitate vesicle from which a few short branches 

 emerge; these branches, usually without branching again, enlarg- 

 ing at their tips to form secondary vesicles, which at maturity 

 are covered with short sterigmata bearing conidia; the conidio- 

 phore rarely unbranched and bearing the conidia on the primary 

 enlargement somewhat as in the genus Rhopalomyces (Thaxter 

 1891: pi. 3); conidia resembling the sporangiospores in shape 

 but non-ciliate, longitudinally striate, and provided at the base 



