16<) Illinois Sidle Uihoraforji of Natural History. 



The synonymy of this species is discussed by Professor Far- 

 low'in the'Biilletin of the Bussey Institution, II, p. 245. 



U/caladii, (Hchw.) Farlow. 



I. Jl]cidia scattered over the whole under surface of the 

 leaf, short,"with a spreading border; spores subglobose to ellip- 

 tical, angular, minutely roughened, 15-18 by 18-24 n^'. sperni- 

 ogonia also hypophyllous, scattered, preceding and accompany- 

 ing the aicidia. II., III. Amphigenous; sori scattered, round 

 or oblong, often long remaining partly covered by the epider- 

 mis, frequently confluent. II. Spores pyriform, truncate at 

 the base, epispore thick, slightly thicker at the apex, conspicu- 

 ously echinulate, 15-21 by 25-32 i^. III. Spores oral, sub- 

 globose or pyriform, smooth, apiculate, 16-21 by 25-32 ^l.\ ped- 

 icels about as long as the spores, very fragile and deciduous, 

 leaving a small portion attached. 



On Ariso'tna triphyllnm : McLean, May 23. 4755, I., Aug. 

 1, 2359, III., Aug. 6/ 2358, III.; LaSalle, June 15, 4991, I. 

 A. dracontium : Union, April 14, 4098 (spermogones), April 

 17, 4135, I., April 29, 4394, I.; Jackson, April 18, 4164, I., 

 April 19, 4193, I.; Pulaski, May 1, 4399, I., II., May 2, 4423, I, 

 May 6, 4527, I., II., III., May 10, 4590, I.; Johnson, May 12, 

 4633, I., II.; McLean, May 23, 4754, I., July 20, 2357, III., 

 July 29, 2356, III.; LaSalle, June 21, 5258, I., II., III.; Adams, 

 July 3, 5391, II., III., July 5, 5410, III., July 6, 5435, II., III., 

 July 7, 5445, II., III., July 10, 5459, I., III.; Tazewell, July 22, 

 2355, III.: Piatt, Aug. 17, 1114, III.; Kane, Aug. 30, 1384, 

 III.;|Rock Island, Sept. 24, 1642, III. Peltandra virginica: 

 Indiana, near Cook Co. line, Sept. 7, 1456, II., HI. 



The following is the synonomy of this species: Uredo 

 CaJadii, Schw. Syn. Fung. Car. [1822], No. 480. Ca^oma 

 (Uredo) Ari Virginici, Schw. Syn. N. Am. Fungi [1834], No. 

 2839. Uromyces Peltandrce, Howe. Bull. Torr. Bot. Club, V. 

 [1874], p. 43. Uromyces Ari-Virginici, Howe. 1. c, p. 43. 

 Uromyces Pontederio'^ Ger. 1. c. VI, p. 31. Uromyces Ariscemrf. 

 Cke. 1. c, p. 32. 



Schweinitz was probably mistaken at first in his host plant, 

 and means to correct the error by changing the specific name 

 to Ari Virginici in the N. Am. Fungi. His description in the 



