THE PIN-MOLD FUNGI 



497 



a mycelium.^ The vegetative hypha? of Mucor form no par- 

 titions,, hence we may consider the entire horizontal branch- 

 work shown in Fig. 324 as one cell. Its position marks it as 





Fig. 326. — Pin-mold. Formation and germination of zygospore. 1, two 

 conjugating branches of the mycelium in cc^ntact. 2, separation of the 

 tip of each by cross-partitions, thus forming two "conjugating-cells" 

 (a, a) and two "suspensors" (6, b). 3, more advanced stage; warty 

 thickenings have begun to form on the conjugating cells, which, how- 

 ever, are still separate. 4. ripe zygospore {h) between the suspensors 

 (a, a) ; the conjugating cells now having completely fused. 5, zygo- 

 spore germinating by producing a vertical hypha with dust-spore case 

 at the tip. 1-4, magnified 225 diameters; 5, about 60 diameters. 

 (Brefeld.) 



the pseudo-root of the plant, and for a while it is the only 

 member developed. Pin-shaped vertical hyphffi, which may 

 be called pseudo-stems, arise into the air from the feeding 

 mycelium, and the tip or ''head" of each being separated by 

 1 My-ce'li-um < Gr. mykes, a fungus. 



