USTILAGO ZE^E 139 



or on a hard manure-extract agar surface. If such 

 viable spores are available, draw the germinating 

 spore, showing the germ- tube, orbasidium (promycel- 

 ium), and attached basidiospores (sporidia). How 

 many cells to the basidium, and how many basidio- 

 spores to each? 



4. What is the function of the chlamydospore? Of 

 the basidiospore? 



5. From your reading, or otherwise, record how the 

 corn-smut disease survives the winter, and how it 

 is spread, as well as the amount of damage it may do. 



6. Compare the corn smut with the wheat smut as 

 to the character of the lesions, the method of infec- 

 tion, and the methods of control. 



