23 



under the name Ear lea speciosa, made some two years ago. This 

 rust occurs upon any and all species of roses in North America, 

 both wild and cultivated, and extends throughout the United 

 States and southern Canada. Its omnivorous and adaptable 

 habits are in marked contrast with the fastidious and restricted 

 habits of all true species of Phragmidmin on roses found in the 

 same region. 



In carefully going over the available material of American rose 

 rusts, properly assignable to the genus Phragjnidiinn, the old 

 world species, P. disciflorum and all the species erected by Dietel 



Fig. 2. Spores of the three species of Phragmidium on rose having stout telio- 

 spores : 4, P. Rosae-arkansanae, 5, P. iiioniivagum, 6, /■". disciflorum ; I, aecio- 

 spore, II, urediniospore. III, teliospore. 



are confirmed, as common in North America, together with one 

 additional species now to be described. In defining these spe- 

 cies, characters have been drawn from all three stages of the rust, 

 aecial, uredinial, and telial. The new species may be character- 

 ized as follows : 



