584 ARTHUR: NEw UREDINEAE 
On Poa nevadensis Vasey, Fort McKinney, Wyoming, August, 
1808, Williams & Griffiths (Griff. W. Am. Fungi 355; type); P. arida 
Vasey, Wood River, Nebraska, July 28, 1906, /. 7. Bates 3930, 
Loup City, Nebraska, June 22, 1907, /. M. Bates; Poa sp., Bil- 
lings, Montana, September, 1898, Williams & Griffiths (Griff. W. 
Am. Fungi 355@); Piedmont, Wyoming, August 4, 1901, L. i 
Pammel 2179. The species resembles Puccinia epiphylla (L.) 
Wettst. (P. Poarum Niels.), but in the uredinial stage is readily 
distinguished by the slightly larger spores and absence of para- 
physes, and in the telial stage by the more pronounced stroma, 
paler sori and larger teliospores. Rev. J. M. Bates has found it 
a number of times growing intermixed with Oxygraphis Cymbalaria 
(Pursh) Prantl, bearing aecia, and suggests that the two forms 
may be genetically related. 
Puccinia perminuta sp. nov. 
O-and I. Pycnia and aecia unknown. 
II. Uredinia amphigenous or only epiphyllous and caulicolous, 
scattered, oval, small, 0.1-0.3 mm. long, tardily naked, pale-yellow, 
pulverulent, ruptured epidermis noticeable ; urediniospores globoid 
or broadly ellipsoid, 15-18 x 16—22 p, wall very pale-yellow, 
thin, 1 or less, sharply echinulate, pores about 6, scattered, 
obscure. 
III. Telia amphigenous or only epiphyllous and caulicolous, 
oval, small, 0.1-0.3 mm. long, often confluent, covered by the 
epidermis, blackish ; stroma usually wanting ; teliospores oblong, 
12-16 x 25-39 , slightly or not constricted at septum, obtuse at 
both ends, wall chestnut-brown, smooth, thin, I-I.5 /#, much 
thickened above, 5-10 4, concolorous; pedicel very short, colored. 
On Agrostis hyemalis (Walt.) B.S.P., Sugar Grove, Ohio, Sep- 
tember 23, 1905, W. A. Kellerman 4299 (type); Houston, Texas, 
April 17, 1869, H. W. R [avenel], uredinia only (specimen in her- 
barium of U. S. Department of Agriculture, said to be on 777 
chodium); A. perennans (Walt.) Tuckerm., Durbin, Pocahontas 
County, West Virginia, August 28, 1902, W. A. Kellerman 3960. 
The species differs from P. Agrostidis Plow. in the smaller spores 
of both sorts, and a less development of stroma, and in other less 
prominent characters. No one has yet made a suggestion as to 
its probable aecial connection. 
