DETAILED ACCOUNT OF SPECIFIC DISEASES OF PLANTS 505 



each cell of which produces a basidiospore. Infection of the nascent 

 tissue at any part of the growing corn plant is accompUshed by the 



Fig. 179. — Smut boil of Ustilago zea on ear of corn, developed from one infecte4 

 kernel. (After Jackson, F. S., Bull. 83, Del. Coll. Agric. Exper. Slat., December, 

 1908.) 



basidiospores and not by the chlamydospores (Fig. 181). Wet weather 

 is essential for the growth of the corn and the smut also. 



