Part 5, 1920] AECIDIACEAE 339 
ILLustRaTIoNsS: Grove, British Rust Fungi 259; Erikss. & Henn. Getreider. pl. 5, f. 57-61, 
pls, 6~9; Beitr. Krypt. Schweiz 2?: f. 265; Zeits. Pflanzenkr. 8: 336; Krypt.-fl. Brand. Pilze 3: f. B188; 
Rostr. Plantep. Haandb. f. 92. 
Exsiccatr: Barth. Fungi Columb. 3763, 4369, 4756; Barth. N. Am. Ured. 1063, 1755; Garrett, 
Fungi Utah. 138, 191, 192. 
91. Dicaeoma Hordei (Fuckel) Arthur & Fromme. 
Puccinia Hordei Fuckel, Jabrb. Ver. Nat. Nassau 15:16. 1860. 
O and I. Pycnia and aecia unknown. 
II. Uredinia mostly epiphyllous, oblong, 0.2-0.5 mm. long, rather long covered by the 
epidermis, opening by a slit or pore, pulverulent, pale-yellow or cinnamon-brown, ruptured 
epidermis inconspicuous; urediniospores ellipsoid or obovoid, 18-24 by 22-28 un; wall pale- 
yellow or colorless, 1-1.5 » thick, closely and rather finely echinulate, the pores 9-12, large, 
scattered. 
III. Telia mostly hypophyllous, scattered or circinating about the uredinia, oval or linear, 
0.2~1 mm. long, long covered by the epidermis, compact, chocolate-brown, surrounded by a 
thin, chocolate-brown stroma; teliospores angularly obovoid or clavate, 16-24 by 39-58 nu, 
obtuse or truncate above, narrowed below, slightly constricted at septum; wall chestnut-brown 
above, somewhat lighter below, 1.5-2.5 » thick, thicker above, 3-7 4, smooth; pedicel colorless, 
short; mesospores usually few, angularly obovoid, 16-23 by 32-40 nz. 
The species differs from Dicaeoma glumarum (Schmidt) Arth. & Fromme in lacking the striped 
arrangement of the uredinia, in larger and more distinct pores in the urediniospores, and in thicker 
and darker-colored walis of the teliospores. It differs from D. anomalum (Rostr.) Arth. & Fromme in 
the larger number of pores in the urediniospores, and in the abundance of two-celled teliospores with 
few mesospores. 
On POACEAE: 
Hordeum Gussoneanum Parl., California. 
Hordeum montanense Scribn., Oregon, 
Hordeum murinum 1, California, Oregon. 
Hordeum nodosum 1.., California, Oregon. 
TyPHz Locality: Nassau, Germany, on Hordeum murinum. 
DISTRIBUTION: Pacific coast of the United States from Oregon to southern California; also im 
Europe. 
ILLUSTRATIONS: Krypt.-fl. Brand. Pilze 3: f. B179. 
Exsiccatt: Barth. N. Am. Ured. 1740; Sydow, Ured. 1780. 
92. Dicaeoma anomalum (Rostr.) Arthur & Fromme. 
Puccinia straminis simplex Korn. Land. Forstw. Zeit. no. 50. 1865. 
Puccinia Hordei Otth, Mitt. Nat. Ges. Bern 1870: 114. 1871. Not P. Hordei Fuckel, 1860. 
Uromyces Hordei Nielsen, Ugeskr. Landm. 1: 567. 1875. 
Puccinia anomala Rostr.; Thiim. Flora 61:92. 1878. 
Puccinia simplex Erikss. & Henn. Zeits. Pilanzenkr. 4: 260. 1894. Not P. simplex Peck, 1881. 
Aecidium ornithogaleum Bub&ak, Ann. Mye. 3: 223. 1905. 
O. Pycnia amphigenous, intermixed with the aecia or alone in rounded groups, occupying 
large areas, honey-yellow, becoming blackish, globoid, 100-150 x in diameter; ostiolar filaments 
present. 
I. Aecia scattered among the pycnia, cupulate, small, 0.2-0.3 mm. in diameter, opening 
by an apical pore; peridial celis irregularly oblong, the outer wall thick, 6-8 », transversely 
striate, the inner wall verrucose, thinner, 3-4 4; aeciospores ellipsoid, 18-30 » in diameter, 
minutely and closely verrucose. 
On LILIACEAE: . 
Ornithogalum tenuifolium Guss. and O. umbellatum L., only in Europe. 
II. Uredinia amphigenous, scattered, oblong or linear, 0.5-1 mm. long, rather early naked, 
pulverulent, cinnamon-brown, ruptured epidermis conspicuous; urediniospores broadly ellip- 
soid, 16-24 by 22-29 »; wall yellowish, 1.5-2 » thick, finely and loosely echinulate, the pores 
8-10, scattered, rather indistinct. 
III. Telia amphigenous, scattered, elliptic or oblong, 0.2-1 mm. long, dark blackish-gray, 
long covered by the epidermis, bordered by a thin layer of brownish stromal hyphae; telio- 
spores angularly oblong or clavate, 18-25 by 39-58 u, truncate, rounded or obtuse above, 
usually narrowed below, slightly constricted at septum; wall chestnut-brown, moderately thin, 
