I',in/si/if FiiiKji of lll'ntoi.^. 1()<,) 



Oil k'iives of Sc/rjins j/in/tif/h'.s : ('hiimpaigii. Ati<^. 13. 

 10:51. II.. III.: Piatt, Aug-. 1(5, lOSS: LaSalle, Sei)t. K). ir)51. 

 Sept. -id. 1.V.I7: Ogle, Sept. 22, ()114. II.. III. 



The leaves are thickly mottled with conspicuous brown 

 spots, not detinitely eircimiscrihed. The' appearance is nearest 

 to that of ('roiin/ccs spii)iina\ Farlow ( T^. jiivci. var. i<partina\ 

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

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

 differently sha])ed spores. 



U. acuminatus, .Arthur. 



II.. 111. Hyi)ogeiious. sori scattered, elongated, soon 

 naked, ruptured epidermis ragged, conspicuous. Uredospores 

 globose or oval, somewhat echinulate. Teleutospores very 

 irregular, subglo1)ose to clavate, sometimes rounded or trun- 

 cate, but usually conspicuously and variously pointed: epispore 

 thin, smooth, yellowish brown, 15-18 by 24-39 n: pedicel 

 rather slender, somewhat colored, from one to three times 

 length of spores. 



1. Unknown. II., If]. Sori linear, narrow, elonjiated, on the un- 

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

 encircling epidermis somewhat conspicuou.s. 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 .001()3 in. long; 

 wall thin; apex much thickened, .^0032 to .00048 in. thick, more or less 

 obliquely acuminate, or rarely only apiculate, sometimes with two 

 pointed terminations, one longer than tlu' 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. .\I. p. :^5. 



On leaves of Sport inu ci/nosiiroidcs: McHenry, Aug. 26, 

 1326. I.. [I.: LaSalle, Sept. 16. ir,r)9. 



Among the I'roini/ccfes 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 



