THE FUNGI 



249 



(Sect. 315). 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. 



Fig. 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, h, hyphse of mycelium; o, 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 algse more 

 or less resembling Vaucheria. 



