PLATE I 
Median longitudinal diagrammatic figures showing comparative differences in the 
means of aeciospores, urediniospores, and teliospores of biologic forms of Puccinia 
graminis. 
A, B, and C.—Diagrams of aeciospore, urediniospore, and teliospore of P. graminis 
tritici. 
D, K, and F.—Similar diagrams of P. graminis secalis. 
G, H, and I.—Similar diagrams of P. graminis avenae. 
J and K.—Similar diagrams of urediniospore and teliospore of P. graminis 
phleipratensis, 
L, M, and N.—Diagrams of aeciospore, urediniospore, and teliospore of P. graminis 
agrostis, 
(S68) 
