I'll Id s // i( ■ I'' II II (J i of Illiiio is . 'in .■") 



Urowii. tt'ltMiiosporcs usiiallv three, soiiu'tiiues two. luon* often 

 four-celled, ohloug or i)roa(lly clavute. somowhat constricted at 

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

 rowed toward the base, ei)ispore thin, smooth. 21-27 by :5()-0(» /t; 

 ])edicel hyaline. taperin<< l)elow. from one third to one half 

 the lent^'th of the sjjore. 



On leaves of PotmtilUi Canadensis: L'nitm. A])ril K). 5()lo. 

 II.. April 2(). 4:ni. IT.. April 2U. 4890. IT.; Jackson. April 19. 

 1177, TT., April 2S. 48(>(). IT.: Pulaski. May 9, 4579. TI.; John- 

 son. May 12. t(>r.J. II.; LaSaHe. June IT). 4999. II.. Sept. 2S. 

 ()22;}. III.. Sept. 2W. 6282, TIL; Adams. June 27, 5807. II.. .Inly 

 8, 5884, II., July 5, 5407, IT., 5417, II., Jnly 6, 5441. II.. July 

 10, 5401. IT.: McLean. Jnly 20, 2415, II.: McHenry, Aug. 25. 

 1821, IT.. IIL: Stephenson. Sept. 13, 5816. IL; JoDaviess. Sept. 

 ]5. 58U6, TIL; Ogle. Sept. 26, 6188, IT., TIL: Fult.m. Oct. 8. 

 1781, TL, riL: Jersey, Oct. 12. 6274, III. 



This is J*li. friarfinilatiini. B. & C; but there is little rea- 

 son to consider the American specimens specifically distinct 

 from the Euro))ean PJi. fra(/aria'. according to Winter's de- 

 scription (Die Pil/,e. p. 228), and the specimens in Habh. Herb. 

 Myc, 281. On neither the latter m)r the Illinois specimens 

 Avas there ol>s('rve(l any roughness of tiie epis]>ore. 



Ph. mucronatum, ( I'ers. ) Ijk. 



I.. 11. . ill. .licidia amphigenous. on the leavesmore com- 

 monly hypophyllous. and of different sizes, but usually small, 

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

 the larger veins. ])etioles. and young stems confluent and sw(d- 

 len. conspicuous, causing more or less distortion of the host, 

 surrounded by clavate. incurved, colorless paraphyses. bright 

 orange-colored: tecidiospores subglobose or angular, produced 

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

 ,«: uredosori hypoi)hyllons. small, scattered, very numerous, 

 sometimes sparingly confluent, surrounded by numy incurved, 

 clavate. colorless [)arai)hyses. yellow; uredospores subglobose. 

 rough-warty, each produced on a pedicel. \S i^: teleutosori hy- 

 pophyllous. scattered, small, powdery, brownish-black: teleuto- 

 spores cylindrical or oblong-elliptical, vertex narrowed ami mu- 

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



