PLATE XXXIV 
Fig.*i.—Growth of organism of head-smut of sorghum and maize on carrot agar at 
various temperatures; cultures about 6 weeks old. X 4/s- 
Figs. 2 and 3.—Twenty-two days' growth of organism of head-smut of sorghum and 
maize on synthetic glucose agar (fig. 2) and on carrot agar (fig. 3). Photographed by 
Mr. E. C. Johnson and author. 
Fig. 4.—Chlamydospores of organism of head-smut of sorghum and maize formed 
in culture in peptonized maltose solution. In the upper right-hand comer are shown 
some natural spores for comparison. X 450. Drawn by author. 
