a. bunt or stinking smut of wheat (Fife); head to the right with glumes removed to show 

 smutted kernels (smut balls) in place; two whole and two broken smut balls shown be- 

 low; b, a sound head of wheat (Minnesota No. 188), with sound grains shown below; c, 

 loose smut of wheat (Minnesota No. 188); to the right a head from which all of the 

 spores have been blown, leaving the bare stock. 



f 



if i W 





d, two heads of covered smut of barley (Minnesota No. 105); e, a sound head of barley; 

 /, loose smut of barley; to the right a head from which the spores have been blown. 



FIG. 138. Smuts of Cereals. Heads of Wheat and Barley showing the Com- 

 mon Smuts. Bui. 152, B. P. I., U. S. Dept. of Agric. 

 271 



