Part 4, 1920] AECIDIACEAE 329 
Festuca rubra L,., Oregon, Wyoming. 
Festuca subulata Trin. (F. Jonesii Vasey), Oregon, Washington. 
Poa brevipaniculata Scribn. & Williams, Colorado. 
Poa longiligula Scribn. & Williams, Colorado. 
TYPE LOcALity: Colorado on Sym phoricarpos oreophilus. 
x oo North Dakota to British Columbia, and southward to Oklahoma and central 
alifornia. 
Exsiccati: Barth. Fungi Columb. 2262, 4660; Barth. N. Am. Ured. 836, 1435, 1643, 1839, 2130; 
Brenckle, Fungi Dak. 76, 81; Clements, Crypt. Form. Colo. 556, 579; Ellis & Ev. Fungi Columb. 
873, 1701; Ellis & Ev. N, Am. Fungi 18/4; Garrett, Fungi Utah. 19, 176, 184, 185; D. Griff. W. Am. 
Fungi 295; Rab.-Wint. Fungi Eur. 3016; Roum. Fungi Gall. 3866; Sydow, Ured. 1950; Vesterg. 
Micr. Rar. Sel. 1001. 
81. Dicaeoma Cockerellianum (Bethel) Arthur & Fromme. 
Puccinia Cockerelliena Bethel; Arth. Bull. Torrey Club 46: 113, 1919. 
O. Pycnia amphigenous, opposite or surrounded by the aecia, few, honey-yellow becoming 
brownish, flattened-globoid, 107-128 » broad by 65-103 » high; ostiolar filaments 40-60 B 
long. 
I, Aecia hypophyllous or caulicolous, in small crowded groups 3 mm. or Jess across, on 
slightly larger discolored spots, low-cupulate or somewhat bullate, 0.3—0.4 mm. in diameter; 
peridium colorless, opening by a central pore, soon disappearing; peridial cells rhombic, 16- 
23 by 27-35 yu, the outer wall thick, 6-8 u, smooth, transversely striate, the inner wall thinner, 
2-3 wu, coarsely verrucose; aeciospores angularly globoid or ellipsoid, 18-24 by 20-29 u; wall 
pale-yellow or colorless, moderately thick, 1.5-2.5 y, finely and evenly verrucose. 
ON RANUNCULACEAE: 
Thalictrum Fendleri Engelm., Colorado. 
II. Uredinia epiphyllous, few, intercostal, oblong-linear, 0.5-1 mm. long, cinnamon- 
brown, pulverulent, ruptured epidermis evident; urediniospores ellipsoid, 19-26 by 24-32 u; 
wall colorless or nearly so, moderately thin, 1.5-2 wu, finely and moderately echinulate, the 
pores obscure, probably scattered. 
III. Telia epiphyllous, scattered or in small groups, intercostal, oblong or linear, 1-2 mm. 
long, grayish-black, long covered by the epidermis but becoming exposed by longitudinal 
slits, without stromal hyphae; teliospores cylindric or clavate-cylindric, 13-21 by 50-85 u, 
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 1 z, 
moderately thickened at apex, 3-7 »; pedicel short, tinted. 
On POoscEaE: 
Festuca Thurberi Vasey, Colorado. 
Tyre Locality: Lake Eldora, Colorado, on Festuca Thurberi. 
DistrRiBuTion: High altitudes in Colorado. 
Exsiccati: Barth. N. Am. Ured. 616. 
82. Dicaeoma Piperi (Ricker) Arthur & Fromme. 
Puccinia Piperi Ricker, Jour. Myc. 11: 114. 1905. 
O and I. Pyenia and aecia unknown. 
II. Uredin ia amphigenous, scattered or somewhat grouped, oblong or linear, 0.5-2 mm. 
long, rather tardily naked, pulverulent, golden-brown, ruptured epidermis conspicuous; 
urediniospores globoid or ellipsoid, 15-18 by 21-26 4; wall pale- or golden-yellow, 1.5-2 u 
thick, moderately and finely echinulate, the pores 8-10, scattered. 
Ill. Telia bypophyllous, often confluent in small groups, oblong or linear, 0.5-2 mm. long, 
grayish-black, long covered by the epidermis, bordered by a thin brownish stroma; teliospores 
oblong or oblong-clavate, 19-26 by 42-62 », rounded or truncate above, usually narrowed below, 
slightly constricted at septum; wall moderately thick, 1.5-2.5 », sometimes slightly thickened 
above, up to 54, dark chestnut-brown, frequently with a few longitudinal angles giving a 
striated appearance; pedicel colorless, one half to once length of spore; mesospores rather 
common. 
ON POACEAE: 
Festuca elatior L., Utah. . 
Festuca pacifica Piper, California, Oregon. ; 
Typr Locality: Eight Dollar Mountain, Oregon, on Festuca pacifica. 
DIstRiBurion: Oregon to Utah and southern California. 
