2 BOTANICAL GAZETTE [jULY 



paper, appears to be exclusively American. Several European 

 species now known to occur upon Phragmites have not yet been 



found in America.- 



The writer's attention was first called to the confusion in the 

 American species when studying the uredospores upon Spartina, 

 preparatory to undertaking cultures. The results of subsequent 

 study are now presented in systematic order, and with suffi- 

 cient fullness, it is believed^ to permit of the ready identification 

 of material. 



In this paper, whenever actual specimens are cited, the kmd 

 and abundance of the spores present are indicated by the cipher 

 and Roman numerals: O. I. 11. III. If the spore receptacles 

 are well formed and fairly abundant, large (capital) type is 

 used; and if the spores are few and subordinate, small (lower- 

 case) type is used. Thus, II, iii, indicates that well-formed 

 uredosori are present, but that the teleutosori are comparatively 

 few, or that what teleutospores are present are borne in the 

 uredosori. 



Grateful acknowledgment is made to a number of mycolo- 

 gists for the loan of specimens. Professor T. J. Burrill of the 

 University of Illinois, Professor L. H. Pammel of the Iowa State 

 College, Professor W. G. Farlow of Harvard University, Pro- 

 fessor L. R. Jones of the University of Vermont, Professor F. S, 

 Earle of the Alabama Polytechnic Institute, and the custodians 

 of the Philadelphia Academy of Sciences and the New York 

 Botanical Gardens, placed a portion of the herbaria under their 

 charge at my disposal ; while the following botanists either 

 loaned specimens from their herbaria or gathered material from 

 the field for my use: Messrs. H. L. BoUey, R. I. Cratty, E. VV. 

 D. Holway, G. W. Carver, H. H. Hume, J. J, Davis, E. Bar- 

 tholomew, S. M. Tracy, T, H. MacBride, P. H. Rolfs, L. M 

 Underwood, and C. E. Bessey. I am furthermore especially 

 indebted to Mr. A. B. Seymour for the generous loan of a part 

 of his herbarium, which proved remarkably rich in collections 

 representing nearly all the species covered by this paper. 



All figures accompanying this paper are drawn with camera 



