1 82 MORPHOLOGY. 



394. Zoogonidia of saprolegnia. The sporangium opens at 



Fig. 1 06. 

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



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- Fig. 198. 



Downy mildew of grape (Plasmopora viti- Phytophthora infestans showing pe- 



cola), showing tuft of gonidiophpres bearing culiar branches ; gonidia below, 



gonidia, also intercellular mycelium. (After 

 Millardet.) 



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



