PLATE 58 



Infected leaves from plants of Chaetospernum glutinosum in the greenhouse ex- 

 periments, showing the types of canker spots produced: 

 A. — Spots extremely small and nontypical. 

 B. — Spots small, oily, raised, and unruptured. 

 C. — Spots of medium size, ruptvu-ed, and slightly corky. 

 Natural size. 



