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 accomplished by the 



Fig. 179. — Smut boil of UsUlago zea on ear of corn, developed from one infected 

 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 essentia] for the growth of the corn and the smut also. 



