260 



THE LOWER FUNGI— PHYCOMYCETES 



discussion homologized the conidia of Choanephora with the 

 sporangiola of Blakeslea, and suggests that the conidia are to 

 be regarded as monosporous sporangiola. Although he was 



Fig. 92. — Blakeslea trispora Thaxter. (a) Typical many-spored sporangium. 

 (6, c) Selected individuals illustrating the transition from sporangium to spo- 

 ra'ngiolum. (d) Typical sporangiola borne over globose heads at the apex of a 

 fertile hypha. (e) Group of such globose heads denuded of sporangiola. (/) 

 One head with five sporangiola attached, {g) A single sporangiospore. (After 

 Thaxter 1914.) 



unable to separate mechanically an outer thin sporangial wall 

 from the conidia of C hoariephora he figures somewhat abnormal 

 conidia of C. cucurbitarum in which its existence is indicated. In 

 any case homology of conidia and sporangia is very evident in 

 these genera. 



