182 NATURAL HISTORY BULLETIN. 



obtusis, linearibus, abbreviatis. Sporidiis fuscis. Quamquam non 

 confluit, tameti fere tota folia occupat." 



SYX : 



1822. Aecidiiim peiitastemonis Schw. Schrift. d. Nat. 

 Ges. zu Leipzig 1:68. 



1895. Puccinia americana Lagh. Ured. Herb. Fries 

 :45. 



1898. DiccEoma andropogonis Kuntze. Rev. Gen. PI. 

 3:467. 



0. Spermogonia few, amphigenous, bright orange when 

 fresh: spots none or colorless: spermatia elliptical or 

 oblong, 3-4 by 5- 7m. 



1. Spots circular, yellow and splashed with purple, or 

 with a distant purple border: secidia mostly hypophyllous, 

 the border low, recurved and split into few segments: 

 spores angular, 16-18 by 18-24/*, slightly tuberculate: 

 peridial cells quadrangular, 16-20 by 24-32/*. 



II and III. Hypophyllous: sori small, elliptical, or 

 confluent and linear, numerous, surrounded by the ruptured 

 epidermis: uredospores yellowish-brown, echinulate, glob- 

 ose, mostly 20-24/*, membrane rather thin (about 2/*) : 

 teleutospores smooth, thickened above, obovate to ellipti- 

 cal, 20-24 by 28-32/*, dark brown, with apex rounded, or 

 oblong to clavate, 16-20 by 36-44/*, color paler and with 

 apex sometimes pointed: pedicel tinted, about the length 

 of the spore. 



Exsic : 



Ellis, N. A. F., 1470 11] . 



Carleton, Ured. Amer., 12 111 . 



Ellis & Everhart, Fungi Columb., 1376 l11 , 1457 1X1 . 



Sydow, Uredineen, 57 1X1 . 



Kellerman & Swingle, Kans. Fungi, 28 l . 



The cultures on which the association of secidia and 

 teleutospores is based were made by Messrs. Arthur and 

 Stuart in 1899 (Bot. Gaz. 29:272). The species is very 

 abundant east of the Rockv mountains in both the secidial 



