158 Illinois State Laboratory of Natural History. 



the exsiccated specimen of Ellis, and the Illinois collections, 

 sori also occur on the stems, in this differing from Cooke's des- 

 cription of U. triquetra, and the spores are not commonly an- 

 gular, certainly not usually three-sided. The above description 

 is drawn from specimens on Elodes virginica. On Hypericinn 

 mutilum the sori occur on both stems and leaves, are smaller 

 and rounded, and bhe spores are rather smaller and lighter 

 colored. 



U. terebinth!, (DC.) Wint. 



Amphigenous; spots yellow or yellowish red or none, usu- 

 ally small; sori minute, scattered or crowded, soon naked. II. 

 Spores elliptical, often roundish or oblong, usually obtusely 

 pointed, covered with spiral lines of minute warts or beads, yel- 

 lowish brown, 25 by 25-40 /*., on a short hyaline deciduous 

 pedicel. III. Spores vertically compressed or globose, with an 

 obtuse cap-like point, verrucose with prominences in short ir- 

 regular undulating lines, dark brown, about 25 p long (ver- 

 tical dimension) and 30 /^ wide; pedicel hyaline, stout, perma- 

 nent, several times as long as the spore. 



Uromyces toxicodendri, B. & R. Effused, rufous; spores ovate, ob- 

 tuse or apiculate, marked witli short lines somewhat like the sporidia 

 of Ascobolusfurfuraceus. Berk. Grev. vol. III., p. 56. 



Pileolaria brevipes, B. & R. Forming little specks on the under side 

 of the leaves; stem short, nexuous; spores at first globose, with three 

 coats, then depressed with a central nucleus. .00114 in. diam. Berk. 

 Grev. vol. III., p. 56. 



On leaves, petioles and stems of Rhus toxicodend ron : Cham- 

 paign, June 9, 4928, II.; Adams, June 27, 5319, II., July 6, 

 5432, IL, July 12, 5523, II.; McLean, July 12, 2442, II., July 

 16, 2437, IL, III, 2438, II, III, July 20, 5605, II, 5606, IL. 

 July 22, 2439, II, 2440, II, III, Aug. 1, 2442, II, III, Aug. 

 4,2443, II, III., Sept. 6, 5657, II, III, Oct. 6, 1811; Piatt, 

 Aug. 15, 1066, II, III.; McHenry, Aug. 24, 1266, II, III.; La 

 Salle, Sept. 14,1534, II, III.; Stephenson, Sept. 14, 5883; Ogle. 

 Sept. 25, 6167; Jersey, Oct. 14, 6317: Union, Oct. 25, 2019. 



This is often referred to the genus Pileolaria. Cast.; but 

 mycologists are pretty well agreed (Leveille, Tulasne, Winter, 



