PLATE 9 
Camera-lucida drawings of Phytophthora parasitica var. rhei* 
A. —Different views of zoospores killed with osrnic acid fumes and stained with 
dilute gentian violet. 
B. —Zoospores gradually coming to rest, showing enlargements at tips and disappear* 
ance of the flagellae. 
C. —Irregular zoospores, one of them with four flagellae, consisting probably of two 
individuals not yet pulled apart. The others also were killed shortly after emergence, 
before they had time to attain normal shape. 
D. —Germinating zoospores in different stages. 
E. —Germinated zoospores producing chlamydospores. 
F. —Germinated zoospore with production of sporangium. 
G. H. —Sporangium production from pure cultures. 
Each scale division represents i/ioo mm. 
