184 ABOUT FUNGI. [CHAP. 
have to call it hereafter), and, germinating, repeat the 
process described in Peniciliium. But in this species 
there is an alternative method of 
reproduction shown in figs. 137 
and 138. Two aerial hyphe (H) 
in the same vicinity throw out a 
branch each. These branches 
have dilated ends which ulti- 
mately come into contact with 
each other. A septum or divi- 
sion is formed across the branch 
just below the dilated end, so that 
the branch becomes terminated 
by a cell. After these two cells 
come in contact, their applied 
faces become attached, the inter- 
vening cell-walls become absorbed, 
and the protoplasm of the two cells mingle and form 
one large cell—the zygospore. It is very different in 
Fic. 136. 
Fic. 138. 
Fic. 137. 
nature to the ascospore, for the latter, on germinating, 
gives rise directly to a perfect Mor; but the zygo- 
spore produces a short hypha, which gives off an erect 
