ARTHUR: NEW SPECIES OF UREDINEAE 153 
The species appears to be well defined, and is quite likely 
heteroecious. 
Aecidium conspicuum sp. nov. 
O. Pycnia amphigenous, numerous, crowded in round groups, 
0.3-I mm. across, small, honey-yellow, subepidermal, flask- 
shaped, 100-125 uw in transverse diameter 
I. Aecia amphigenous, in large, dense groups 3-8 mm. across, 
on slightly larger discolored spots; peridium erect or somewhat 
recurved, finely lacerate; peridial cells angularly oval in face view, 
26 by 32-38, oblong in radial section, 16 by 32-38, strongly 
overlapping, the inner wall 10-12 uw thick, verrucose, the inner wall 
about I 4, smooth; aeciospores globoid, 19-23 4 in diameter; wall 
colorless, thin, I wu, finely verrucose. 
On Dugaldea Hoopesit (A. Gray) Greene (Helenium Hoopesii 
A. Gray), La Plata River, Colorado, 9,500 ft. alt., July 16, 1898, 
Baker, Earle & Tracy 1075; mountains near Pagosa Peak, Col- 
orado, 9,000 ft. alt., August 10, 1899, C. F. Baker 113; Cloudcroft, 
New Mexico, July 19, 1899, E. O. Wooton; Winsor Creek, Pecos 
National Forest, New Mexico, July 28, 1908, Paul C. Standley 
4581; Rio Pueblo, New Mexico, August 11, 1910, E. O. Wooton; 
Little Colorado River, White Mts., Arizona, July 20, 1910, L. N. 
Goodding; Trout Lake, Colorado, 10,000 ft. alt., August 2, 1912, 
Arthur & Kern 5108; Snowball Creek near Pagosa Springs, 
Colorado, 7,200 ft. alt., August 6, 1912, Arthur & Kern 5521 
(type); Ute Park, Colfax County, New Mexico, August 25, 1916, 
Paul C. Standley 13756. 
This rust is quite common in the Rocky Mountains from 7,000 
to 10,000 feet altitude. The plants grow from two to three feet 
tall, and the long lanceolate leaves are often conspicuously yel- 
lowed by the abundant aecia, which show strongly against the 
cinereous surface of the host. It is undoubtedly a heteroecious 
species. In 1912 Dr. F. D. Kern and the writer searched the two 
localities where the rust was found by them for a possible alternate 
form, but in vain. Similar efforts have been made by Mr. E. 
Bethel, but with no better success. 
Aecidium Pereziae sp. nov. 
O. Pycnia chiefly epiphyllous, closely grouped, honey-yellow 
becoming brown, punctiform, noticeable, subepiderma 
