250 



THE LOWER FUNGI— PHYCOMYCETES 



of the main hypha above the septum. At the point of contact 

 the main hypha pushes out and cuts off a small gametangium. 

 The much enlarged tip of the lateral branch cuts off the other. 

 The zygospore formed by their union is thus always homothallic 

 in origin. The termination of the main hypha is often turned 

 to one side, and projecting beyond the zygospore as a slender 

 prolongation gives the zygophoric apparatus a characteristic 

 aspect. 



Fig. 87.^ — Zyoorhynchus heterorjamiis Vuillemin. (a-g) Successive stages in 

 conjugation terminating in formation of zygospore. {After Blakeslee 1913.) 



10. Mucor Micheli, in Nova Plantarum Genera, p. 215, pi. 95, 1729; 



also see Link in Linnaeus Species Plantarum (4 edit.), 6: 80, 



1824. 



syn. Hydrophora Tode {Fung. Meckl., 2: 5, 1791). 

 Mycelium developed profusely both in and on the substratum, 

 lacking definite rhizoids and stolons; sporangiophores not fascic- 

 ulate as in Rhizopus, arising singly from the mycelium, erect, 

 simple or somewhat branched in a monopodial or sympodial 

 manner; all the branches terminated by sporangia; sporangia 

 large, globose, many-spored; sporangial wall evanescent in most 

 species, not cutinized, more or less incrusted with crystals of 

 calcium oxalate; columella always present, various in shape; 

 sporangiospores globose to ellipsoidal, with a thin, smooth wall; 

 zygospores borne on the mycelium; suspensors lacking out- 

 growths; copulating branches lying end to end, forming a straight 



