302 NORTH AMERICAN FLORA [VoLUME 7 
41. Dicaeoma scaber (Ellis & Ev.) Arth. Résult. Sci. Congr. 
Bot. Vienne 344. 1906. 
Uromyces scaber Ellis & Ev. Jour. Myc. 6: 119. 1891. 
Uredo Eriocomae Ellis, Jour. Myc. 7: 275. 1893. 
Puccinia subsierilis Ellis & Ev. Bull. Torrey Club 22:58. 1895. 
Uredo Eriocomae Ellis & Ev. Bull. Torrey Club 24: 285. 1897. 
Uredo luxurians Ellis & Ev. N. Am. Fungi 3583. 1898. 
O and I. Pycnia and aecia unknown. 
II. Uredinia of the typical sort rarely seen, epiphyllous, scattered, elliptic or oblong, 
0.5-1 mm. long, cinnamon-brown, early naked, pulverulent, ruptured epidermis noticeable; 
urediniospores globoid or broadly ellipsoid, 18-23 by 21-27 u; wall golden- or pale cinnamon- 
brown, 1.5-2 u thick, closely and conspicuously echinulate, the pores 4-6, scattered. 
Uredinia of the modified sort (amphisori) common, persistent, epiphyllous, numerous, 
elliptic, or oblong-linear, 0.5~2 mm. long, early naked, somewhat pulverulent, dark chestnut- 
brown, pulvinate, ruptured epidermis noticeable; urediniospores of the modified sort (amphi- 
spores) ellipsoid or obovoid, 19-26 by 26-35 y; wall dark cinnamon- or dark chestnut-brown, 
2.5-3 » thick, sometimes thicker at apex, 3-5 », moderately and strongly, occasionally finely 
echinulate, the pores 4-6, scattered, sometimes appearing equatorial; pedicel often persistent, 
fragile, colorless, twice to thrice length of spore. 
III. Telia free from amphispores, rare or possibly not formed; teliospores few, oblong or 
ellipsoid, 16-24 by 30-45 pn, rounded or somewhat truncate above, seldom attenuate, rounded 
or tapering below, noticeably constricted at septum; wall golden- or cinnamon-brown, 1.5 » 
thick, darker above, 3-7 »; pedicel pale-yellow or colorless, as long as spore or longer. 
On PoackEaz: 
Oryzopsis hymenoides (R. & S.) Ricker (O. cuspidata Benth., Eriocoma cuspidata Nutt., 
E. hymenoides Rydb.), California, Colorado, Montana, Nevada, New Mexico, Utah. 
Stipa Lettermani Vasey, Colorado, New Mexico. 
Stipa minor (Vasey) Scribn., Colorado. 
Stipa Nelsonii Scribn., Colorado. 
Stipa Scribneri Vasey, Colorado, New Mexico. 
Stipa Vaseyi Scribn. (S. robusta Scribn.), Colorado, New Mexico. 
Stipa viridula ‘Trin. (S. spartea Hook. not Trin.), Colorado, Montana, New Mexico, North 
Dakota, South Dakota, Wyoming; Manitoba. 
Type Locality: Swift Creek, Custer County, Colorado, on ‘‘leaves of some grass’ [Stipa 
viridula). 
DISTRIBUTION: Manitoba to Montana, southward to southern California, and New Mexico. 
ILLUSTRATIONS: Bull. Lab. Nat. Hist. Univ. Iowa 4: pl. 7, f. 28a. 
Exsiccatr: Arth. & Holway, Ured. Exs. Ic. 28a; Barth. N. Am. Ured. 63, 369, 573, 1668, 2072; 
Barth. Fungi Columb. 3268, 3467, 5075; Brenckle, Fungi Dak. 84; Clements, Crypt. Form. Colo. 
325; Garrett, Fungi Utah. 240; D. Griff. W. Am. Fungi 6, 175, 325; Ellis & Ev. Fungi Columb. 548, 
1192, 1662, 2161; Ellis & Ev. N. Am. Fungi 3141, 3583; Sydow, Ured. 2040. 
42. Dicaeoma micranthum (D. Griff.) Arthur & Fromme. 
Puccinia micrantha D. Griff. Bull. Torrey Club 29: 299. 1902. 
O. Pycnia chiefly epiphyllous, grouped on yellowish spots 2-8 mm. across, noticeable, 
honey-yellow, flattened-globoid, 112-122 » wide by 96 high; ostiolar filaments 90-1124 
long, agglutinated into a short column. 
J. Aecia chiefly hypophyllous but also found on petioles and young fruit, crowded in 
groups 2-10 mm. across, cylindric, large, 0.3-0.5 mm. in diameter, 0.5-3.0 mm. high; per- 
idium white, the margin erose, somewhat recurved; peridial cells rectangular or somewhat 
rhomboidal in radial longitudinal section, 16-19 by 26-324, somewhat overlapping by a 
slight downward projection of the outer wall, the outer wall 8-12, thick, transversely 
striate, the inner wall thinner, 2-3 u, closely verrucose; aeciospores globoid or angular, 15- 
18 by 16-25 »; wall colorless, 1.5-2 thick, very closely and finely verrucose. 
On GROSSULARIACEAE: ’ ; 
Grossularia leptantha (A. Gray) Cov. & Britt. (Ribes leptantha A. Gray), Colorado. 
Grossularia setosa (Lindl.) Cov. & Britt. (Ribes setosum Lindl.)}, South Dakota. 
Il. Uredinia epiphyllous, usually few, distinct, circular or oblong-elliptic, small, 0.2— 
0.3 mm. long, cinnamon-brown, early naked, ruptured epidermis inconspicuous; uredinio- 
spores globoid or broadly ellipsoid, 15-19 by 18-22 u; wall light cinnamon-brown, 1.5 yz thick, 
finely and closely echinulate, the pores 6-8, scattered. 
