THE FUNGI 249 
(Sect. 815). The zygospore formation of bread-mold consid- 
erably resembles the mode of spore production in Spirogyra 
(Sect. 282), but the mold gametes contain many nuclei. 
Fie. 174. Spore-Formation in Potato-Blight (Phytophthora 
infestans), one of the algal fungi. 
A, a well-developed group of stalks, proceeding from a mass of mycelium 
inside the leaf and escaping through a stoma; B, a young, unbranched 
stalk. A, hyphe of mycelium; 0, stoma; s, spore. (Both figures 
greatly magnified, B more than A.) 
It appears highly probable that such algal fungi as 
Rhizopus are degenerate descendants of green alge more 
or less resembling Vaucheria. 
