378 ARTHUR: NEW SPECIES OF UREDINEAE 
pronounced differences. A collection on H. jubatum made at 
Provo, Utah, without date, S. M. T: racy 712, is the only other 
material belonging to this species that I have seen. Although the 
rust is on a very common and widely distributed host, it seems to 
be rare or restricted in its distribution. Possibly it has been 
overlooked by collectors, owing to its being rather inconspicuous. 
Without examination under the microscope it might readily be 
mistaken for the common subepidermal Puccinia on the same host, 
which goes under the name P. rubigo-vera. 
Uromyces agnatus sp. nov. 
II. Uredinia chiefly hypophyllous, scattered, often confluent, 
irregularly roundish, 0.2-0.5 mm. across, early naked, soon 
21-29u; wall light golden brown, rather thick, 2-2.5u, sparsely and 
inconspicuously echinulate, pores usually distinct, 2, opposite 
III. Telia chiefly hypophyllous, scattered, roundish, 0.1-0.4 
mm. across, at first bullate, soon naked, pulverulent, dark choco- 
late-brown; teliospores oval, somewhat narrowed above and below, 
23-29 by 29-35u; wall chestnut-brown, 3-4y, slightly thicker 
above, 5-7, coarsely and inconspicuously verrucose; pedicel color- 
less, slender, fragile, about length of spore. 
On Jatropha stimulosa Michx., Dunedin, Fla., Nov. 26, I9OI, 
S. M. Tracy 7278 (type); Sanibel Island, Fla., May 17, 1901, S. M. 
Tracy 7234; Summerville, S. C., Aug. 13, 1902, C. L. Shear 1553; 
Lake Worth, Fla., July, 1894, P. H. Rolfs 17; Jensen, Fla., no date, 
P.H. Rolfs 55. This species has been confused with the wholly 
distinct Mexican species on Jatropha, Uromyces oaxacanus D. &. H. 
In Sydow’s Monog. Ured. 2: 183, the description under U. oaxa- 
canus is chiefly that of the northern species. In Mexico there is 
still a second distinct species on Jatropha, U. Jatrophae D. & H. 
PURDUE UNIVERSITY, 
LAFAYETTE, INDIANA. 
