THE PIN-MOLD FUNGI 497 
a mycelium.' The vegetative hyphe 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 
Fic. 326.—Pin-mold. Formation and germination of zygospore. 1, two 
conjugating branches of the mycelium in contact. 2, separation of the 
tip of each by cross-partitions, thus forming two ‘““conjugating-cells”’ 
(a, a) and two ‘‘suspensors” (b, b). 3, more advanced stage; warty 
thickenings have begun to form on the conjugating cells, which, how- 
ever, are still separate. 4, ripe zygospore (b) between the suspensors 
(a, a); the conjugating cells now having completely fused. 4, 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 hyphz, 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. 
