EXERCISE 85 (Continued) 



These cluster cups are produced by the same fungus that 

 produces red and black rust in wheat, but the fungus grows 

 somewhat differently in barberry. Find out, by reading, the 

 relation of barberry to rust in wheat fields and the whole story 

 of the life history of the wheat rust. 



Good microscopic sections will assist in the study of all three 

 of the above forms. 



References 



BERGEN and CALDWELL. Practical Botany, pp. 243-245. 

 BERGEN and CALDWELL. Introduction to Botany, pp. 253-256. 



[108] 



