266 



THE LOWER FVNGI—PHYCOMYCETES 



Berk. & Br. (Xenomyces Cesati, Ackermannia Pat.), and Glaz- 

 iella Berk. {Endogonella v. Hohnel.) The genus Endogone (see 

 Bucholtz, 1912: 147) is the largest and most interesting member 

 of the group (Fig. 96). In certain of its species thick- walled 

 zygospores arc produced in compact groups, the whole mass 

 usually being enclosed in a hyphal envelope. A definite fruit 

 body thus results which recalls on the one hand the zygosporic 



Fig. 95.- — (a) Morticrella candelabrum v. Tiegham & le Monnier, showing 

 branching sporangiophore. (b) M. fusispora v. Tieghem. "Stylospore" (coni- 

 dium). (c-e) M. nigreacens v. Tieghem, showing successive stages in zygospore 

 formation. {After v. Tieghem and le Monnier 1873, 1876.) 



envelope of Mortierella and on the other the more definite fruit 

 body of the Ascomycetes. In other species of the genus the 

 interior of the fruit body is filled with azygospores (chlamydo- 

 spores), and in still others with sporangia. In one known species 

 zygospores and chlamydospores occur together, but neither of 

 these spore forms has been found in any of the sporangia-pro- 

 ducing species. The sporangia resemble those of Mortierella. 

 The zygospore is formed in a bud put out by the fusion cell which 

 results from the copulation of the gametangia, and appears to 

 surmount them. Thus, though resembling Mortierella in 



