PLATE a 
Types of susceptibility shown by offspring of seifs and crosses between rye plants 7, 
8, 9, and 10 to leaf rust of rye, Puccinia dispersa. Xa. 
A. —Uredinia very large, often circular. Type 4. 
B. —Uredinia midsized, less often circular. Type 3. 
C. —Uredinia midsized, infected areas somewhat chlorotic. Type 3. 
D. —Uredinia midsized or large, sometimes accompanied by definite hypersensitive 
spots. Type X. 
E. —Uredinia midsized or large, infected areas green, bordered by chlorotic tissue. 
Type 4. 
F. —Uredinia midsized in large, definite hypersensitive spots. Type 2. 
G. —Uredinia small in less definite hypersensitive spots, the latter sometimes 
without uredinia. Type 1. 
H. —Hypersensitive areas abundant, only occasionally containing small uredinia. 
Hypersensitive areas few, indefinite, no uredinia produced. Type o. 
