GRASSES OF IOWA. 



221 



Fig. 108 Maize smut spores Rermi- 

 nating in sugar solution, i Bref eld 

 U. S. Sept. Agr.) 



Fig. 110. Maize smut germinating 

 In water. (Brefeld D. S. Dept. Agr.) 



Fig. 109. Maize smut {Ustilago maydis) ; a, mycelium of fungus and cells of the host. 

 en. S. Dept. of Agrl.) 



