P(ir((s/h'c Fionji of ll/hiois. 205 



brown, teleutospores usually three, sometimes two. more qiien 

 four-celled, obloiiii: or broadly clavate. i=!omewhat constricted at 

 the septum, vertex slightly thickened, obtusely rounded, nar- 

 rowed toward the base, epispore thin, smooth, 21-27 by 86-90 fi; 

 |>edicel hyaline, tapering below, from one third to one half 

 the length of the spore. 



On leaves of Potent ilia Canadensis: Union, April 16, 5015. 

 II.. April 26, 4311, II.. April 29, 4890. IT.; Jackson. April 19. 

 4177. TI.. April 28. 486(>. II.: Pulaski. May 9, 4579. II.: .lohn- 

 son. May 12, 4651. II.; LaSalle. June 15. 4999. II.. Sept. 28. 

 6228, III.. Sept. 29. 6282, III.: Adams, .lone 27, 5807, II.. July 

 8. 5384, II.. July 5, 5407, II., 5417, XL, July 6, 5441. II., July 

 10, 5461, II.; McLean, July 26, 2415, II.: McHenry, Aug. 25. 

 1321, II.. III.; Stephenson. Sept. 13, 5816, II.; JoDaviess, Sept. 

 15. 5896. III.; Ogle. Sept. 26, 6188, II., III.: Fulton. Oct. 3. 

 1781, II., III.: Jersey, Oct. 12, 6274, III. 



This is Ph. triarticiilatum, B. & C; but there is little rea- 

 son to consider the American specimens specifically distinct 

 from the European Ph. ffaijayia'. according to Winter's de- 

 scription (Die Pil/e. p. 228), and the s])ecimens in Rabh. Herb. 

 Myc, 281. Oji neither the latter nor the Illinois specimens 

 was there observed any roughness of the epispore. 



Ph. mucronatum, ( Pers. ) Lk. 



I.. II.. III. ^cidia am[thige)ious. on the leaves more com- 

 monly hyi)0])liyllous, and of different sizes, but usually small, 

 in little groups on a distinct reddish, yellow-bordered spot, on 

 the larger veins, petioles, and young stems confluent and swol- 

 len, conspicuous, causing more or less distoiiion of the host, 

 surrounded by clavate. incurved, colorless })araphyses, bright 

 orange-colored: a?cidiospores subglobose or angular, produced 

 in erect chains, becoming rough-warty towards maturity. 18-24 

 w: uredosori hypophyllous. small, scattered, very numerous, 

 sometimes sparingly confluent. s\u-rounded by many incurved, 

 clavate. colorless ])ara]»hys('s. yellow; uredos])ores subglobose. 

 rough-warty, eacdi ))roduced on a pedicel. 18 ,u: teleutosori hy- 

 ])ophyllous. scattered, small, powdery, brownish-black; teleuto- 

 spores cylindrical or oblong-elli))tical. vertex narrowed and mu- 

 cronate. apiculus hyaline, six- to eleven-septate, rather coarsely 



