THE POTATO FUNGUS, PERONOSPORA INFESTANS. 
PLATE IV. 
The fungus as reproduced from its resting spores, enlarged 400 diameters. 
Q. Peronospora mycelium with young plant (Q:) among starch of potato 
tubes. 
Similar fragment of mycelium on cuticle of Potato leaf. 
Branch of fungus with numerous partitions. 
Well-grown branch with full-grown conidium at apex. 
Conidium discharging zoospores. 
Conidium discharging protoplasm. 
Weak plant developing strong secondary thread. 
Madd de 
Oospore with discharged bladder containing secondary bladders, 
Y.Y.Y. which produce mycelium or Pythium-like, 
Z. Zoospores. 
