340 NORTH AMERICAN FLORA [VoLuME 7 
about 1.5 », darker and thicker at apex, 3-6 », smooth; pedicel tinted, short; mesospores abund- 
ant, more numerous than the two-celled spores, 15-25 by 26-32 yz. 
_ This species is not distinguishable morphologically from Nigredo Hordet (Tracy) Arth. with 
aecia on Nothoscordium (cf. Arthur, Mycologia 8 : 139. 1916), except in the production of two-celled 
teliospores. The two forms should be united eventually under one name. 
On PoacEaE: 
Hordeum vulgare L., California, Indiana, Iowa, Kentucky, Michigan, New York, Ohio, 
Oklahoma, Oregon, Tennessee, Wisconsin; Mexico (state) ; Ontario. 
Type Locality: Skarup, Denmark, on Hordeum Zeocriton. 
DISTRIBUTION: New York to Iowa, and from Oregon to Utah southward through California 
to central Mexico; also in Europe. 
ILLUSTRATIONS: Beitr. Krypt. Schweiz 2?: f. 266; Grove, Brit. Rust Fungi f. 202; Zeits. Pflan- 
zenkr. 8: 335, f. 4, 337, f. 5; Krypt.-fl. Brand. Pilze 3: f. Bi78; Rostr. Plantep. Haandb. f. 93. 
93. Dicaeoma subdigitatum (Arth. & Holway) Arthur & Fromme. 
Puccinia subdigitata Arth. & Holway; Arth. Am. Jour. Bot. 5: 468. 1918. 
O and I. Pycnia and aecia unknown. 
II. Uredinia amphigenous, scattered, elliptic, small, about 0.5 mm. long, early naked, 
yellowish, pulverulent, ruptured epidermis inconspicuous; paraphyses few, oblong or clavate, 
10-15 by 26-35 », the wall pale cinnamon-brown, 1-2 u thick; urediniospores globoid or broadly 
ellipsoid, 12-15 by 14-19 »; wall thin, 1 » or less, pale-yellow or colorless, finely and closely 
echinulate, the pores obscure, probably scattered. 
III. Telia chiefly hypophyllous, crowded but seldom confluent, elliptic or oblong, 0.5~ 
1 mm. long, dark-gray, long covered by the epidermis, bordered by a thin layer of dark-brown 
stromal hyphae; teliospores oblong or clavate-oblong, 10-16 by 27-45 yn, truncate above, or 
with a few, 1-5, short digitate projections, usually somewhat narrowed below, slightly or not 
constricted at septum; wall dark chestnut-brown above, paler below, thin, about 1 yu, slightly 
thickened at apex, 3~7 w including projections; pedicel very short, tinted. 
ON POACEAE: 
Brachypodium mexicanum (R. & S.) Link, Guatemala. 
Type LocaLiry: San Rafael, Department of Guatemala, Guatemala, on Brachypodium mexi- 
canum. 
DIstRIBUTION: Known only from the type locality. 
94. Dicaeoma Arundinariae (Schw.) Kuntze, Rev. Gen. 3?: 467. 
1898. 
Puccinia Arundinariae Schw. Schr. Nat. Ges. Leipzig 1:72. 1822. 
O and I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, scattered or in groups, circular or broadly elliptic, about 
‘0.5 mm. in diameter, early naked, pulverulent, dark cinnamon-brown, ruptured epidermis con- 
‘spicuous; urediniospores globoid or broadly ellipsoid, 26-29 by 29-34 u; wall dark cinnamon. 
brown, 2-2.5 « thick, moderately and strongly echinulate, the pores 4, occasionally 3, equatoriale 
Il. Telia hypophyllous, scattered, circular or broadly elliptic, about 1 mm. in diameter, 
chocolate-brown, early naked, prominently pulvinate and largely superficial, ruptured epidermis 
not apparent; teliospores oblong or cylindric, 18-24 by 47-77 u, both ends somewhat tapering, 
slightly constricted at septum; wall light chestnut-brown, 2-2.5 » thick, smooth, moderately 
thickened at apex, 4-7 »; pedicel colorless, long, once to twice length of spore. 
On POACEAE: 
Arundinaria macrosperma Michx., Alabama, Oklahoma, South Carolina, Texas. 
Avundinaria tecta (Walt.) Muhl., Alabama, Louisiana, Mississippi, South Carolina. 
Arundinaria sp., North Carolina. . 
Tyree LocaLity: Salem, North Carolina, on Arundinaria sp. 
DistRiBuTION: North and South Carolina to Oklahoma and Texas. 
Exsiccatt: Barth. Fungi Columb. 2347, 4751; Barth. N, Am. Ured. 925, 1743. 
95. Dicaeoma melanocephalum (Sydow) Arthur & Fromme. 
Puccinia melanocephala Sydow, Ann. Myc. 5: 500. 1907. 
O and I. Pycnia and aecia unknown. 
Il. Uredinia hypophyllous, scattered, round, 0.3-1 mm. in diameter, early naked, pulveru- 
lent, cinnamon-brown, ruptured epidermis conspicuous; paraphyses peripheral, borne on 
