1 82 MORPHOLOGY. 



394. Zoogonidia of saprolegnia. The sporangium opens at 



Fig. 196. 

 Branch of saprolegnia showing oogonia with oospores, eggs matured parthenogcnetically. 



the end, and the zoogonidia swirl out and swim around for a 

 short time, when they come to rest. With a good magnifying 



Fig. 197. 



Downy mildew of grape (Plasmopora viti- 

 ofg 



Fig. 198. 



Phytophthora infestans showing pe- 

 culiar branches ; gonidia below. 



cola), showing tuft ofgonidiophpres bearing 

 gonidia, also intercellular mycelium. (After 

 Millardet.) 



power the two cilia on the end may be seen, or we may make 



