ji of Illinois. 165 



The teleutoform occasionally occurs on the midribs of the 

 leaves and (in No. 2152) even on the blade. 



In 1/797 Persoon (Disp. Meth.) named this plant Puccinia 

 polyyom, but afterwards wrote P. Polygoni Avicularice (Syn. 

 Fung. [1801], p. 227.) Schroter in 1869 (Rost u. Br. Pilze 

 Schlesiens) adopted the name Uromyces Avicularice. Fuckel 

 published the name as Uromyces Polygoni in 1869 (Symb. 

 Myc., p. 64). 



U. euphorbias, C. P. 



II., III. Amphigenous; spots purple or yellowish; sori 

 scattered, round, small. II. Sori distinguished by their lighter 

 brown color, spores globose, minutely roughened, pale brown, 

 15-21 n in diameter. III. Spores subglobose, oval or obovate. 

 slightly apiculate, warty, 15-18 by 18-25 ^, interspersed with 

 numerous slender paraphyses; pedicels about twice the length 

 of the spore, slender, hyaline, very fragile and deciduous, leav- 

 ing a small portion attached to the spore. 



Leaves generally stained with red or purple; sori amphigenous, sub- 

 rotund, slightly convex, surrounded by the ruptured epidermis, ferru- 

 ginous-brown or blackish -brown; spores subglobose, rough, often with a 

 large nucleus, about .0008 in. in diameter; peduncle short, hyaline. 

 Peck, XXX Rep. N. Y. Mus. p. 90. 



On leaves of Euphorbia maculata : McLean, July 16, 2352; 

 McHenry, Aug. 22, 1221, Aug. 25, 1301; LaSalle, Sept. 16, 

 1548 and 1550; Lee, Sept. 8, 5712; Rock Island, Sept. 21, 1616; 

 Jersey, Oct. 14, 6316. E. hypericifolia : Adams, July 6, 5431, 

 II., III.; McLean, July 7, 2353, Oct. 6, 1802; Tazewell, July 22, 

 2354; Piatt, Aug. 15, 1064, Aug. 17, 1104; Rock Island, Sept. 21, 

 1615; Ogle, Sept. 23, 6143; Union, Oct. 21,- 1840. E. dentt : 

 Adams, July 6, 5427, II., III., 5428. II., III.; Jersey, Oct. 12, 

 6263, II., III. E. heterophylla: Ogle, Aug. 28, 5641, II., III., 

 Sept. 23, 6144, Sept. 28, 6182, II., III.; Lee, Sept. 9, 5754, II., 

 III. Euphorbia sps.: McHenry, Sept. 1, 1409. 



The pedicels are deciduous, as are those of U. Hoirei, Peck, 

 and the surface of the spore is similarly roughened. sEcidium 

 euphorbia*, Pers., accompanies the Uromyces in Nos. 1064, 1548, 

 1616, and 2353, but it is believed by most botanists to have no 

 connection with this Cromyces. 



