126 



THE PHYCOMYCETES 



Pky corny ces nit ens is of interest because of the height of turf 

 formed by the sporangiophores, which rise to a height of 6 to 

 12 inches or more above the substrate. In nature this turf may 

 form a veritable carpet on the earthen basement floor of cotton- 



FiG. 41. Choanephora ciiciirbitarimi. A. Apex of sporangiophore with 

 capituli developing on the primary head. B. .Mature capitulum covered 

 with conidia. C. Side view and end view of conidium. D. Nodding spo- 

 rangium that contains spores with tufts of hair-like appendages, as in E. 

 F. Chlamydospores from old cultures. G and H. Stages in zygote forma- 

 tion. Each mature zygote contains a large oil droplet. 



seed-oil mills or on seed beds fertilized by the use of cottonseed 

 meal. The area immediately beneath the sporangium bends to 

 direct the sporangium toward the source of light. Its photo- 

 trophic responses are considered in Chapter 6, Volume II. 



Among the species parasitic on other Alucorales, Dispira cor- 

 7iuta is perhaps of most interest. Ayers (1935) found that it 

 has a more extensive host range than any other parasitic species 

 of the Alucorales. In fact, he demonstrated its parasitism on 



