Parasitic Fungi of III i HOI'S. 169 



On leaves of Scirptt-s fluviatilis: Champaign, Aug. 13, 

 1031, II., III.; Piatt, Aug. 16, 1088; LaSalle, Sept. 16, 155l| 

 Sept. 20, 1597; Ogle, Sept. 22, 6114, II., III. 



The leaves are thickly mottled with conspicuous brown 

 spots, not definitely circumscribed. The appearance is nearest 

 to that of Uromyces spartince. Farlow ( U. junci, var. spartince, 

 Ellis Exs. No. 239), of anything found, but it is sufficiently 

 distinct in the characteristics of the sori, and in the larger, 

 differently shaped spores. 



U. acuminatus, Arthur. 



II., III. Hypogenous, sori scattered, elongated, soon 

 naked, ruptured epidermis ragged, conspicuous. Uredospores 

 globose or oval, somewhat echinulate. Teleutospores very 

 irregular, subglobose to clavate, sometimes rounded or trun- 

 cate, but usually conspicuously and variously pointed; epispore 

 thin, smooth, yellowish brown, 15-18 by 24-39 jt*; pedicel 

 rather slender, somewhat colored, from one to three times 

 length of spores. 



I. Unknown. II., III. Sori linear, narrow, elongated, on the un- 

 der surface of the leaves plane or slightly convex, sunken, soon naked; 

 encircling epidermis somewhat conspicuous. II. Uredosori yellowish, 

 inconspicuous; uredospores large, round or elliptical, finely and plenti- 

 fully echinulate, brownish yellow, .00088 to .0012 in. broad by .00102 to 

 .0014 in. long. III. Teleutosori brownish black; teleutospores oblong- 

 club-shape and oblong lanceolate to obovate, smooth, golden brown, 

 darker at the apex, .0006 to .00088 in. broad by .0010 to .00165 in. long; 

 wall thin ; apex much thickened, .00032 to .00048 in. thick, more or less 

 obliquely acuminate, or rarely only apiculate, sometimes with two 

 pointed terminations, one longer than the other, very rarely obtuse or 

 rounded ; base narrowed or only acute ; pedicel of uniform thickness, 

 as long as the spore, or shorter, very rarely longer, colored. Arthur, 

 Bull. Minn. Acad. Nat. Sci. Vol. XI. p. 35. 



On leaves of Spartina cynosuroides : McHenry, Aug. 26, 

 1326, I., II.; LaSalle, Sept. 16, 1559. 



Among the Uromycetes inhabiting grasses this is readily 

 distinguished by the irregular and peculiar shape of the teleu 

 tospores. While some are no longer than wide, many are ob- 

 long or nearly lanceolate, while the apex has a multitude of 

 forms: sometimes straight, sometimes acutely acuminate ; often 



