262 THE LOWER FUNGI— PHYCOMYCETES 



with a short hyahne appendage (Thaxter, 1914: ^gr. 18h); inter- 

 calary chlamydospores with more or less thickened walls borne 

 on the mycehum; zygospores observed in various described 

 species (Fig. 93). 



The genus Choanephora is of unusual interest, since in it 

 sporangia and conidia occur together. It is most closely related 

 to the genus Blakeslea in which the conidia are replaced by 

 sporangiola. An interesting undescribed species is mentioned 

 by Thaxter (1914: 358), which grew in culture over a period of 

 years without producing conidia, though sporangia bearing the 

 typical ciliated spores of this group were always present. The 

 following species have been described: 



C. infundihuUJera (Currcy) Sacc. {Syll Fung., 9: 339, 1891). 

 syn. Cunninghamia infundibulifera Currey (1873: 334). 

 Choanephora cunning hamiana Currey (1873: 578). 

 First reported from material collected in India by Cunningham on faded 

 flowers of Hibiscus; also collected by Thaxter (1914: 360) from flowers of 

 the same host in the West Indies and South America. The secondary 

 heads of the conidiophores are persistent, and become cupulate after the 

 conidia have fallen. 



C. simsoni Cunningham (1895: 169). 



Collected in India on Ipomoea and Zinnia. 

 C. cucurbitarimi (Berk. & Rav.) Thaxter (1903: 102). 



syn. Rhopalomyces cucurbitarum Berk. & Rav. {Grevillea, 3: 11, 1875); 

 see Thaxter (1891: 20). 



C. americana Moller (1901: 18). 

 Reported on fading flowers of Hibiscus, Cucumis, Gossypium, Capsicum 

 etc. (Dastur, 1920; Wolf, 1917; Moller, 1901; Thaxter, 1903; 1914). 

 It is parasitic on summer squash (Wolf, 1917). An undescribed species 

 closely related to C. cucurbitarum, but differing in possessing smooth conidia 

 of a lighter color, was collected on flowers of Cucurbitaceae in South America 

 by Thaxter (1914: 361). 



C. persicaria Eddy (1925: 207). 



A species, closely related to the preceding, and found recently causing a rot 

 of peaches. 



C. conjuncta Couch (1925). 

 A dioecious species. 



Saito and Naganishi described in 1915 under the name, Cun- 

 ninghamella mandshurica, a species whose affinities seem to be 

 quite as much with Choanephora as with Cunninghamella. Only 

 conidia are known, and these are longitudinally striate and 

 identical in aspect with those of Choanephora. The conidiophore 

 is of a somewhat intermediate type of branching, there being no 



