114 ARTHUR: NEW SPECIES OF UREDINEAE 
mm. long, cinnamon-brown; urediniospores ellipsoid, 19-26 by 
24-32 w; wall colorless or nearly so, 1.5-2 yu thick, finely echinulate, 
the pores obscure, probably scattered. 
II. Telia similar to the uredinia, long covered by the epidermis, 
becoming dehiscent by a longitudinal slit, grayish-black; telio- 
spores not surrounded by stromal hyphae, cylindric or clavate- 
cylindric, 13-21 by 50-85 wu, rounded or truncate above, tapering to 
base, the upper cell about one third length of spore, slightly or not 
constricted at septum; wall chestnut-brown above, paler below, thin, 
- about I uw, moderately thickened above, 3-7 u; pedicel short, tinted. 
On Thalictrum Fendleri Engelm., Gunnison County, Colorado, 
September 2, 1899, I, E. Bartholomew; Eldora, Colorado, 9,000 
feet alt., July 25, 1910, I, E. Bethel (Barth. N. Am. Ured. 6176); 
Eldora, Colorado, June 24, and July 2, 1911, I, E. Bethel; Trout 
Lake, 10,000 feet alt., August 2, 1912, I, F. D. Kern 5107; Trimble 
Springs, nine miles from Durango, Colorado, 7,500 feet alt., 
August 4, 1912, I, F. D. Kern 5303. 
On Festuca Thurberi Vasey, Eldora, Colorado, 9,000 feet alt., 
September 17, 1910, III; same, May 20, June 24, July 4 (type), 
October 7, 1911, III; same, June 30, 1912, III; same, September 
19, 1914, III; same, July 22, 1916, III, all collected by E. Bethel; 
same, August 25, 1911, II, Bethel & Kern; Fremont Station near 
Manitou, Colorado, August 25, 1916, II, III, J. M. Bates 6486. 
As early as 1910 Mr. Bethel wrote in transmitting specimens 
that these forms of rust on Thalictrum and Festuca, found growing 
together and apparently genetically connected, were noticeably 
different from the forms belonging under Puccinia Clematidis. 
He then transplanted healthy plants of both hosts to his garden 
in Denver, and the following year began a series of cultures, using 
both aeciospores and teliospores, which has extended to the present 
time. Some of the results of these numerous trials have been 
transmitted to the writer; the publication of a full account of the 
work, however, is contemplated by Mr. Bethel, who has supplied 
the name and nearly all the information regarding the species, 
and it is deemed neither necessary nor courteous to give more 
than a bare statement in this connection. Mr. Bethel also sent 
telial culture material several times to the writer, from which 
only one successful germination of spores was obtained. A culture 
followed, the result being recorded in a report of cultures for 1915 
(Mycologia 8: 132. 1916) under the name Puccinia A gropyrt. 
