PHYTOPHTHORA. 



121 



Fig. 32. — Pkytopkthora infestans. The Potato disease. A, Potato leaf with 

 brown spots and white patches of fuDgi on the lower side. £, Groups of conidio- 

 phores emerging from a stoma close beside a hair of the potato leaf. C, Conidio- 

 phores and conidia, much enlarged. B, Leaf of potato much shrivelled up and 

 brown, as in the later stages of the disea-se. (y. Tubeuf del.) 



