278 NORTH AMERICAN FLORA [VoLUME 7 
I. Aecia hypophyllous, in small circular groups 2-3 mm. broad, cupulate, small, 0,2- 
0.3 mm. in diameter; peridium colorless, rather fragile, the margin erect, irregularly lacerate 
or entire; peridial cells oblong, 15-18 by 23-32 y, abutted or slightly overlapping, the outer 
wall smooth, finely striate, 7-10 4 thick, the inner wall verrucose, 2-2.5 4 thick; aeciospores 
globoid or ellipsoid, 13-19 by 18-26 »; wall pale-yellow, about 1.5 4 thick, very finely and 
closely verrucose. 
ON OXALIDACEAE: 
Ionoxalis violacea (L.) Small (Oxalis violacea I,.), Kansas, Nebraska. 
Xanthoxalis flipes Small (Oxalis filipes Small), Oklahoma. 
Xanthoxalis Langloisti Small, Texas. 
Xanthoxalis stricta (L.) Small (X. interior Small, Oxalis stricta L., O. corniculata stricta Sav., 
O. cymosa Small), Indiana, Iowa, Kansas, Nebraska, North Dakota, South Dakota. 
II. Uredinia amphigenous, scattered or in groups, sometimes forming lines, elliptic or 
oblong, 0.5-1 mm. long, or much longer in warm, moist regions, tardily naked, cinnamon- 
brown, pulverulent, ruptured epidermis prominent; urediniospores broadly ellipsoid or globoid, 
23-29 by 26~32 w; wall moderately thin, 1.5~—2 », golden- or cinnamon-brown, very finely and 
moderately echinulate, the pores usually 4, sometimes 3, approximately equatorial. 
III. Telia amphigenous, scattered or sometimes with large sori in large compact groups, 
elliptic or oblong, 1-2 mm. long, rather tardily naked, pulvinate, blackish-brown, ruptured 
epidermis prominent; teliospores oblong or ellipsoid, 16-23 by 29-45 y, rounded or obtuse at 
both ends, or somewhat narrowed below, slightly constricted at septum; wall smooth, dark 
chestnut-brown, 1-2 u thick, moderately thickened above, 5-7 4; pedicel pale-yellow near the 
spore, colorless below, once to twice length of spore. 
On POACEAE: 
Andropogon furcatus Muhl. (A. provincialis furcatus Hack., A. provincialis Am. Auth. not 
Lam.), Oklahoma, Texas. 
Euchlaena mexicana Schrad., Guatemala. 
Zea Meys L., Alabama, Arkansas, California, Colorado, Connecticut, Delaware, Illinois, 
Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Massachusetts, Michigan, Minne- 
sota, Mississippi, Missouri, Nebraska, New Jersey, New Mexico, New York, North 
Carolina, North Dakota, Ohio, Pennsylvania, South Carolina, South Dakota, Texas, 
Vermont, Virginia, West Virginia, Wisconsin, Wyoming; Nova Scotia, Ontario; Mexico 
(state), Puebla; Guatemala; Cuba; Montserrat. 
Type Locaity: [Bethlehem, Pennsylvania], on Zea Mays. 
DISTRIBUTION: Widely distributed from eastern Canada throughout the United States to Mex- 
ico, Guatemala, and the West Indies; also in South America, Europe, and Africa, and probably 
wherever Indian corn is cultivated. ‘The form on Andvopogon is yet imperfectly known. 
ILLUSTRATIONS: Bull. Lab. Nat. Hist. Univ. Iowa 4: pl. 12, f. 32a, b, ¢; Atti Accad. Lincei IT. 
3: pl. 4, f. 149; McAlpine, Rusts Austr. pl. C. f. 14, 15, 16, pl. 2, f. 15; Beitr. Krypt. Schweiz 
22: f. 198° Krypt.-fl. Brand. Pilze 3: f. B396; Corda, Ic. Fung. 6: pl. 1, f. 7. 
Exsiccatt: Arth. & Holway, Ured. Exs. Ic. 32a, 6, c; Barth. Fungi Columb. 2777, 3372, 3671, 
3672, 3970, 4975, 5073; Barth. N. Am. Ured. 368, 569, 970, 1776, 1868, 1966, 2060, 2164, 2265; 
Brenckle, Fungi Dak. 114, 114a; Ellis, N. Am. Fungi 268; Ellis & Ev. N. Am. Fungi 2210; Ellis & Ev. 
Fungi Columb. 257, 1906; D. Griff. W. Am. Fungi 241; Kellerm. Ohio Fungi 95; Rab.-Paz. Fungi 
Eur. 4132; Rav. Fungi Car. 3: 92; Seym. & Earle, Econ. Fungi 72; Shear, N. Y. Fungi 71; Sydow, 
Ured. 921; Thiim. Myc. Univ. 321. 
2. Dicaeoma pallescens (Arth.) Arthur & Fromme. 
Uredo pallida Dietel & Holway; Holway, Bot. Gaz. 24:37. 1897. Not Dicaeoma pallida Kuntze, 
1898. 
Puccinia pallescens Arth. Bull. Torrey Club 46: 111. 1919. 
O and I. Pyenia and aecia unknown. 
Il. Uredinia amphigenous, scattered or in small groups, oval or oblong, 0.3-0.8 min. long, 
somewhat bullate, opening rather tardily by a central rupture, pale-yellowish; paraphyses 
none; urediniospores ellipsoid, obovoid, or pyriform, 13-21 by 20-29 y; wall colorless or nearly 
so, thin, about 1, finely and moderately echinulate, the pores equatorial, very indistinct, 
probably 4. 
III. Telia hypophyllous, scattered or associated in rather indefinite groups about 1 cm. 
across, oval or oblong, 0.5-2 mm. long, long covered by the epidermis, very compact and 
stromatoid, brownish-black due partly to discoloring of surrounding host-tissue; teliospores 
cylindric, 1-4-celled, usually 2- or 3-celled, 9-16 by 26-67 yu, truncate or rounded at both ends, 
slightly or not constricted at septum; wall light golden-brown, thin, 1 », slightly thickened 
above, 2~3 u, smooth; pedicel very short or lacking. 
