PLATE i 
A. —Upper leaves of a wheat culm infected with Urocystis tritici , showing the long 
stripes, or sori. 
B. —An enlarged portion of a wheat leaf infected with Urocystis tritici , showing the 
smut son. 
C. —Flag smut lesions on the lower glumes of an infected wheat head (a), and on the 
leaf sheath ( b). 
D. —Lesions of Urocystis tritici on the lower glumes (a), the rachis ( b ), and the upper 
part of the culm (c). 
( 45 °) 
