Part 2, 1907] UREDINACEAE ” 
2. Uredo confluens Pers. Obs. Myc. 1: 98. 1796. 
Cacoma Ribesti Link, in Willd. Sp. Pl. 62: 26. 1825. 
Cacoma Ribis-alpini Wint. in Rab. Krypt. Fl. 11: 258. 1881. 
Caeoma confluens Schrot. Krypt. Fl. Schles. 31: 376. 1887. 
0. Pycnia chiefly epiphyllous, in small orbicular groups, crowded, minutely puncti- 
form, inconspicuous, subepidermal, somewhat hemispherical, or becoming conoidal, small, 
80-1604 broad, 50-65 high; hymenium flat; pycniospores ovoid. 
I. Aecia hypophyllous, few in crowded groups on scarcely discolored spots, round, 
0.3-0.8 mm. across, often confluent, soon naked, applanate, bright-yellow fading to pale-yel- 
low, pulverulent, ruptured epidermis noticeable; aeciospores broadly ellipsoid or globoid, 
16-19 by 22-26%; wall colorless, medium thick, 1.5-2.5, closely and finely verrucose. 
ON GROSSULARIACEAE : 
kibes saxosum Hook., Utah. 
Ribes vallicola Greene, Colorado. 
II. Uredinia chiefly hypophyllous, usually on noticeable yellow spots, scattered or in 
groups, small, 0.25-1 mm. across, round, pulvinate, pale orange-yellow ; urediniospores 
globoid, rarely oval, 14-18 by 15-224, wall thick, 2-3, sparsely and evenly verrucose, 
with sharp papillae, pores scarcely noticeable; paraphyses capitate or clavate, heads 16- 
25 # broad, 40-70 long, walls thick, 2.5-44. 
III. Telia amphigenous, scattered or in groups, often covering the entire surface, 
small, 0.25-0.5 mm. across, brownish, covered with the epidermis; teliospores irregularly 
prismatic, rounded at both ends, 7-11 by 20-35, wall thin, scarcely 1, light-brown, pores 
obscure. 
ON SALICACEAE : 
Salix sp. in Europe, not yet found in America. 
TYPE LOCALITY: Europe, on Ribes alpinum. 
DISTRIBUTION : Central Rocky Mountain region ; also in Europe. 
3. Uredo alpina (Juel) Arthur. 
Melampsora alpina Juel, Ofv. K. Sv. Vet.-Akad. Forh. 18648: 417. 1894. 
O. Pycnia amphigenous, numerous, scattered or in small groups, orange-red becoming 
chestnut-brown, subepidermal, low-conoidal, 150-210 in diameter by 30-45 high. 
I. Aecia chiefly hypophyllous, scattered, irregular, 0.5-2 mm. across, orange-red fading 
to light-yellow, pulvinate, pulverulent, ruptured epidermis noticeable; aeciospores globoid 
or shortly ellipsoid, 18-21 by 21~26, wall colorless, thick, 2.5-3.54, finely and evenly 
verrucose. 
ON SAXIFRAGACEAE : 
Leptasea flagellaris (Willd.) Small (Sarifraga flagellaris Willd.), Colorado. 
Saxtfraga bracteata D. Don, Alaska. 
II. Uredinia chiefly hypophyllous, scattered, round, 0.2-0.7 mm. across, orange-yellow 
fading to pale-yellow, pulvinate, pulverulent, ruptured epidermis inconspicuous ; uredinio- 
spores globoid or broadly ellipsoid, 13-18 by 17-214, wall colorless, 1.5-2 thick, sparsely 
and evenly verrucose, with fine papillae, pores not evident; paraphyses intermixed with 
the spores, capitate, smooth, 40-65 long, heads 18-27 broad, wall thick, 3-64, peripheral 
paraphyses thinner-walled and more clavate. 
IIl. Telia amphigenous, scattered or sometimes confluent in groups, round, 0.2-0.6 
mm. across, chestnut-brown, slightly elevated, subepidermal ; teliospores prismatic or ob- 
long, 9-13 by 25-40, rounded at each end; wall pale golden-brown, smooth, uniformly 
thin, 1. 
ON SALICACEAE : 
Salix fuscescens Anders., Alaska. 
Salix polaris Wahl., Alaska. . 
Typr LOCALITY: Grjotli, Norway, on Salix herbacea. . ; 
DISTRIBUTION: Summit of Pike’s Peak, Colorado, and boreal region of Alaska; also in Europe. 
ILLUSTRATION : Beitr. Krypt. Schweiz 2?: f. 3/4. 
