AMERICAN UREDINE.E. 319 



Orig. Descr. " Uredolager klein, rostbraun, keine Paraphysen enthaltend. 

 Uredosporen kugelig, ca. 21^ in Durchmesser oder eiformig, 21-25^ 

 lang, 19-24/* breit, blassbraun, stachelig. Teleutosporenlager auf beiden 

 Seiten der Blatter und an den Blattscheiden, in Form von kurzen oder 

 langeren Strichen, polsterfdrmig, fest, scbwarz. Teleutosporen von 

 verschiedener Gestalt, kurz keulenforrnig bis lang spindelformig, an 

 der Basis in den Stiel verschmalert, an der Spitze abgerundet, abge- 

 stutzt oder, in der Mitte zugespitzt, wenig eingeschniirt 33-60/* lang, 

 13-22/* breit. Membran glatt, intensiv gelbbraun, am Scheitel massig 

 oder stark verdickt. Stiel etwas kiirzer oder langer als die Spore, 

 gebraunt, fest. 



SYN: 



1898. Dicceoma amphigenum Kuntze. Rev. Gen. PL 



3:467- 



O. I. Spermogonia and aecidia unknown. 



II. Uredosori amphigenous, small, brownish-yellow, ob- 

 long to linear, ruptured epidermis noticeable, paraphyses 

 none; uredospores globose, about 24/u, in diameter, or ovoid, 

 19-24 by 21-28//., wall rather thin, golden brown, echinulate 

 with low, blunt points, pores 6-8, scattered. 



III. Teleutosori amphigenous, oblong to linear, promi- 

 nent, ruptured epidermis conspicuous, nearly black; teleuto- 

 spores cuneate to obovate-oblong, 18-26 by 35-56^, very 

 little constricted at the septum, apex rounded, obtuse or 

 acutish, much thickened, lower cell longer than the upper 

 and narrowed into the pedicel, which is stout, firm, golden 

 yellow, and the length of the spore or shorter. 



EXSIC : 

 Sydow, Uredineen, 910. 



This species extends from Michigan and Illinois to Kansas 

 and Montana. It is especially variable in the size of the 

 spores, a fact noted by Dietel in drawing up the original de- 

 scription. A specimen collected by F. W. Anderson in Mon- 

 tana, Sept., 1888, has teleutospores that are 22-33 by 41-67^ 

 (according to measurements by E. M. Fisher), and the ure- 

 dospores average about 27/n in diameter. On the other hand 

 a specimen secured from a phanerogamic collection made by 

 L. H. Bailey at South Haven, Mich., Sept., 7, 1882, possesses 



