AMERICAN UREDINE^E. 177 



II. Uredospores obovate, rarely subglobose, 18-30 by 

 28-45/*, wall reddish-brown, deeper colored at the apex, 

 also somewhat thicker at the apex (up to 4/u) , strongly and 

 closely tuberculate, pores distinct, four, equatorial; para- 

 physes numerous, light brown, somewhat capitate, usually 

 curved, wall thickened above. 



III. Teleutospores clavate, cuneate or oblong, 18-22 by 

 40-70/"-, septum above the middle, lower cell pale, thin- 

 walled, upper cell oblong or often subglobose, dark brown, 

 apex much thickened, rounded, obtuse or nearly truncate, 

 pedicel thick and short. 



Exsic : 



Ellis & Everhart, N. A. F., 2888, 3476. 

 Sydow, Uredineen, 1066. 

 Seymour & Earle, Econ. Fungi, 535. 



This rust has proved to be a puzzling species, and no 

 one heretofore has wholly compassed its form and habit; 

 even now the secidial stage is not known. Still it possesses 

 strongly marked characters in both its uredo- andteleuto- 

 sporic stages. The structure and color of the uredospores, 

 together with the clavate paraphyses, are strongly 

 diagnostic, while the unequal and dis- 

 similar-celled teleutospores are fairly 

 distinctive. The uredo stage is often 

 prolonged without intermixture of teleu- 

 tospores, especially in the eastern 

 states. Only uredospores were known 

 to Schweinitz, and only uredospores 

 occur in the collection made by B. M. 

 Duggar in Alabama, which Dietel, 

 sixty-five years later, made the basis 



Fig- 3- . 



caeoma (uredo) andro- of a new name. We have examined 

 SSLtSL sT^ted type material of these descriptions, and 

 at Bethlehem, Pa., iS2 9 . present herewith drawings of spores 

 and paraphyses from each (figs. 3 and 4) . 



Puccinia virgata Ellis & Everhart was founded on 

 material collected in Rooks Co., Kans., on Jan. 23, 1892 



