ARTHUR: NEW SPECIES OF UREDINEAE 377 
Sisyrinchium sp., Lake Waha, Nez Perces Co., Idaho, June 27, 
1896, A. A. Heller 3331. 
Uromyces major sp. nov. 
O and I. Pycenia and aecia unknown. 
II. Uredinia amphigenous, scattered, oval or oblong, 0.3-1 
mm. long, cinnamon-brown; urediniospores broadly ellipsoid, 
19-23 by 21-26y; wall light golden yellow, 2-2.5u thick, strongly 
and evenly echinulate, pores 4, equatorial. 
III. Telia amphigenous, similar to uredinia, blackish brown; 
teliospores broadly ellipsoid, 19-23 by 23-27, usually rounded 
at both ends; wall chestnut-brown, not concolorous, 2—2.5y thick, 
thicker above, 5-9u; pedicel slightly tinted, 5-74 in diameter, 
once to twice length of spore. 
On Muhlenbergia sp., near City of Mexico, Mex., Oct. 2, 1896, 
E. W. D. Holway. The collection on which this species is founded 
is meager and the host is not fully determined, but the rust seems 
so distinct from any other species of Uromyces on grasses, that I 
venture to record it as a form hitherto undescribed. It differs 
‘from the-only other North American species of Uromyces on 
Muhlenbergia,U. minimus Davis, in the much larger spores, in the 
not concolorous and thicker-walled teliospores, and in the very 
different range. 
Uromyces mysticus sp. nov. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia chiefly epiphyllous, scattered, oblong or linear, 
0.5-1.2 mm. long, rather early naked, golden brown, ruptured 
epidermis conspicuous; urediniospores broadly ellipsoid, 24-28 
by 27-32u; wall golden yellow, 2-2.5u thick, finely and incon- 
spicuously echinulate, pores 8-12, scattered. 
III. Telia chiefly hypophyllous, similar to the uredinia, but 
remaining covered by the epidermis; teliospores angularly obovate, 
18-26 by 26-334, rounded or angular above, usually somewhat 
narrowed below; wall chestnut-brown, moderately and uniformly 
thick, 2-2.5u, finely and inconspicuously verrucose; pedicel light 
yellow, one-half to once length of spore. 
On Hordeum jubatum L., Denver, Colo., Oct. 29, 1910, E. 
Bethel (Barth., N. Amer. Ured. gr). This species is readily 
distinguished from Uromyces Hordei Tracy, a somewhat common 
and more widely distributed form, by the finely verrucose telio- 
spores, which are not thickened at the apex, and by other less 
