158 



PRACTICAL BOTANY. 



Another species of Rust, Puccinia rubigo-vera, affects 

 Wheat in the United States. This has no connection 



FIG. 90. Clover Rust, c, cluster cups and aecidiospores ; d, uredospores; 

 /, uredo pustule on Clover leaf ; e, teleutospores ; g, cross section of Clover 

 stem, showing mycelium between cells ; also two teleutospores and one 

 uredospore. (After Pammel.) 



with the Barberry, but its different stages are passed on 

 the Wheat and on plants of the Borage family. 



The abnormal growth on the twigs of Cedar, known 

 as cedar apples, affords opportunity for the study of an- 



