12 BOTANICAL GAZETTE Ijuly 



hart's N. Am. Fungi, 1474, v?. B. Seymour) ; Aug. 1884, III, Bismarck, N. D. 

 (Jour, to Wash. Terr., 296, 302, A. B. Seymour)\ Oct. 1890, III, North Wey- 

 mouth, Mass. (Seymour & Earle's Econ, Fungi, 69, Z. M. Underwood)] 



M, 



Wis 



Wis. ( /. /. Da7Jts\ : No date. III, Ames, Iowa (L, H 



meL 



In naming this very distinct new species I take pleasure in 

 recognizing the services of Mr. A. B. Seymour in the cause of 

 mycological science. One-third of the collections of this species 

 that I have been enabled to study, coming from various sources, 

 were made by him, and it was during my examination of the 

 material in his private herbarium, kindly placed at my disposal, 

 that I became aware of the existence of the species, which has 

 heretofore been an unrecognized part of the preceding one. 



The species is separable from P, Fraxinata, and recognizable 

 with considerable ease, by the position of the teleutosporic sorl 

 on the rough side of the leaf, emerging from between the nerves. 

 They are usually a little lighter in color also. But the final 

 reliance must be upon the uredospores {^fig^ J, ^), which are 

 very distinctive, and a few of which may almost invariably be 

 found intermixed w4th the teleutospores {^fig. J, /) , at whatever 

 season of the year the material may have been gathered. The 

 shrunken contents lying at the base of the spore, and the color- 

 less, tuberculate wall, gives the spores a wholly unique appear- 

 ance among gramineous species. 



Attempts at cultures have been made for three seasons past, 

 but so far in vain. At first the efforts were misdirected from 

 lack of any but the vaguest geographical clues. After detecting 

 and establishing a connection between morphological similarity 

 in uredo and aecidium and also a specific relationship in the pre- 

 ceding species, I searched through the herbarium for some 

 aecidiosporic form having colorless, tuberculate walls, and angu- 

 larly shrunken contents, and was rewarded by finding that 

 jEcidium Cephalanthi Seym, possessed exactl}^ these characters. 

 Its geographical range is also that of P. Seymouriafia, so far as 

 the two are known. In the spring of igoi I was possessed of 



