ARTHUR: NEW SPECIES OF UREDINEAE > a3 
II. Uredinia amphigenous on brownish or purplish spots, 
early or somewhat tardily naked, cinnamon-brown; urediniospores 
globoid or broadly ellipsoid, 23-32 by 27-35; wall cinnamon- 
brown, rather thick, 1.5-2.5 u, closely and finely echinulate, the 
pores prominent, equatorial, 3 or 4, covered with swollen, hyaline 
cuticle. 
III. Telia disposed similarly to the uredinia, chestnut-brown; 
teliospores oblong or clavate, 18-26 by 37-48 u, rounded at both 
ends or slightly narrowed below, usually not constricted at septum; 
wall dark chestnut-brown above, lighter below, 1.5-2.5 u thick, 
thickened 6-8 4 at apex, sometimes also thickened at one side; 
pedicel golden-brown, short. 
On Leptoloma cognatum (Schultes) Chase (Panicum cognatum ~ 
Schultes), Auburn, Lee County, Alabama, August 31, 1890, II, iii, 
Geo. F. Atkinson 1586 (type); Ellsworth County, Kansas, July 
27, 18096, II, iii, C. H. Thompson; Austin, Texas, February 27, 
1901, II, W. H. Long, Jr. 82; Austin, Texas, November 10, 1914, 
II, Lewis & Tharp 4z; Stillwater, Oklahoma, July 27, 1915, II, 
C. D. Learn 128; Austin, Texas, October 29, 1915, II, II, B. C. 
Tharp. The type collection had the host given as probably 
Muhlenbergia diffusa. The material is scanty and without in- 
florescence. Its identity was ascertained through the painstaking 
examination made by Mrs. Agnes Chase. On July 16, 1915, 
she wrote; ‘The specimen marked ‘Muhlenbergia diffusa’ I 
make Leptoloma cognatum. They have the same texture and 
ligule, and the little erect bit of firm tissue on either side at the 
summit of the sheath, where in aged leaves it tears loose from the 
thin ligule as found in Leptoloma.’’ The teliospores were dis- 
covered on type material in April, 1911, but it was not until the 
host was positively identified that the relationship of the rust could 
be worked out. 
Puccinia Cockerelliana Bethel, sp. nov. 
O. Pycnia amphigenous, few, 107-128 » broad. 
I. Aecia hypophyllous or caulicolous, in small groups 3 mm. 
or less across, low cupulate; peridium soon disappearing; peridial 
cells rhombic, 16-23 by 27-35, the outer wall thick, 6-8 x, 
smooth, the inner wall thinner, 2—3 », coarsely verrucose; aecio- 
spores angularly globoid, 18-24 by 20-29 »; wall nearly or quite 
colorless, moderately thick, 1.5-2.5 , finely and evenly verrucose. 
II. Uredinia epiphyllous, intercostal, oblong-linear, 0.5~I 
