PLATE 9 
Spongospora subterranea on the roots of various hosts: 
Fig. A.—Galls caused by Spongospora subterranea on the roots of Solanum warsce- 
* wiczii . In this plant the galls have a tendency to girdle the root. 
Fig. B, C.—Galls caused by Spongospora subterranea formed on the roots of the 
tomato. These galls, owing to the age and size of the plant, show a variety of forms. 
