198 Illinois State Latjoratory of Natural Jlistorij. 



times rounded, narrowed below to the pedicel, smooth, chest- 

 nut-l)rown, 15-21 by 8()-(3() ^; pedicel firm, colored, about the 

 length of the spore, sometimes shorter. 



Sori, dense, linear, bluckisb, spores subturbinate, constricted in tbe 

 middle. — Persoon, Syn. Fung., p. 228. 



On culms, sheaths and leaves of cereals and grasses. On 

 irhmt: McLean, July 11, 2385 and 2343, July 12, 2341, July 

 15, 233<); Tazewell, July 22, 2340; Piatt, Aug. 17, 1134; Mc- 

 Henry, Aug. 20, 1145, Aug. 22, 1224; Fulton, Oct. 1, 1773. 

 Oats: McLean, July 11, 2334, July 12, 2332 and 2333; Taze- 

 well, July 22, 2329, 2330 and 2331; Champaign, Aug. 13, 1029 

 and 1033; Piatt, Aug. 15,1063; McHenry, Aug. 20, 1144, Aug. 

 26, 1323; Fulton, Oct. 1, 1774. Agrostis vulgaris: McHenry, 

 Aug. 24, 1275, Aug. 26, 1324; LaSalle, Sept.' 13, 1521; JoDa- 

 viess. Sept. 18, 5987; Rock Lsland, Sept. 27, 1673; Fulton, Oct. 

 3,1732; McLean, Oct. 4, 1760; Union, Oct. 21,1905. Hor- 

 deum jiihatuDi: McLean, July 11, 2346, July 17, 5580, IL, IIL; 

 July 19, 5593, II., III.; McHenry, Aug. 23, 1231, Aug. 25, 

 1307, Aug. 26, 1316, Aug. 31, 1392; Rock Island, Sept. 26, 1661. 



As here identified a variable species, though some forms 

 often formerly included are specifically separated under the 

 names P. einaciilata, P. in'ndsorke, and P. andropogi. The 

 description is made from specimens on wheat. On Agrostis 

 the teleutospores are sometimes nearly typical (No. 1732), in 

 other cases they vary much in shape and thickness of the epis- 

 pore — shorter, rounder and thinner for the most part on Nos. 

 1275, 1603, and especially 1905. The uredo is very character- 

 istic in all. 



P. phragmites,"(Schum.) Kornicke. 



II., III. Ami)higenous. Sori scattered, very prominent, 

 mostly rather large, elliptical, somewhat powdery, soon naked, 

 the remains of the ruptured epidermis not usually visible; ure- 

 dospores elliptical, epispore very thick, strong!}^ tuberculate, 

 without paraphyses, 18-21 by 27-32 ^: teleutospores elliptical 

 or oblong, somewhat but not abruptly constricted, vertex a lit- 

 tle thickened and rounded or obtusely pointed, smooth, pale 

 brown, 18-22 by 37-60 ;«; pedicel very long, three to four times 



