Bui. 1275, U. S. Dept. of Agriculture 
Plate I 
Ustilago Infection of Oats 
A, Ustilago avenae (Pers.) Jens, on Avena sativa L. var. Victor (natural size); B, Ustilago levis 
(K. and S.) Magn. on Avena sativa L. var. Victor, partially smutted head (two-thirds natural 
size); C, Ustilago levis (K. and S.) Magn. on Avena sativa L. var. Victor, completely smutted 
head (two-thirds natural size) 
