PLATE i 
A. —Young wheat plant affected with flag smut, 29 days from date of inocula¬ 
tion. X %. 
B. —Leaf of wheat plant affected with flag smut. (Partly decolorized.) Natural 
size. 
C. —Plant with head affected with flag smut. The darkened areas on the neck (a) 
represent opened sori filled with spores of Urocystis tritici . (Enlarged.) 
D. —Portion of plant affected with flag smut showing characteristic curling and 
twisting of affected leaves. X 
(490) 
