572 NORTH AMERICAN FLORA [VoLUME 7 
and often confluent in groups 0.1-1 cm. across, on yellowish or purplish spots, small, round, 
0.2-0.5 mm. across, early naked, compact, at first punctate becoming pulvinate, blackish- 
brown becoming cinereous by germination, ruptured epidermis not conspicuous; teliospores 
oblong, cylindric or clavate, often somewhat irregular, 13-19 by 35-55 u, rounded, obtuse, 
or acute above, narrowed below, usually noticeably constricted at septum; wall golden- 
or cinnamon-brown, 1.5-2.5 « thick, usually darker and thickened above, 4-9 », smooth; 
pedicel colorless or tinted like spore, firm, one half length of spore or shorter. 
This species is correlated with Dicaeoma canaliculatum (Schw.) Kuntze, the telial charac- 
ters of the two species being similar or identical, and the hosts of the short-cycled species 
corresponding with the aecial hosts of the heteroecious species. This agreement doubtless 
indicates a common origin of the two species. 
On AMBROSIACEAE: 
Ambrosia elatior I. (A. artemisiaefolia A. Gray not L.), Florida, Kansas, Nebraska, South 
Carolina, Texas. 
Ambrosia media Rydb., Colorado. 
Ambrosia psilostachya DC., Colorado, Kansas, Montana, Nebraska, South Dakota. 
Ambrosia trifida L.., Arkansas, Colorado, Delaware, Illinois, Indiana, Iowa, Kansas, Mis- 
souri, Nebraska, New York, Oklahoma, Pennsylvania, South Dakota, ‘Texas, Virginia, 
West Virginia, Wisconsin; Ontario. 
Xanthium acerosum Greene, Minnesota, North Dakota. 
Xanthium cenchroides Milisp. & Sherff, Colorado. 
Xanthium chinense Mill. (X. longirostre Wallr., X. glebratum Britton, X. canadense Am. 
Auth. not Mill., X. americanum Am. Auth. not Walt., X. strumarium Am. Auth. not 
L.), Alabama, Arkansas, Indiana, Kansas, Kentucky, New York, North Carolina, 
Oklahoma, Pennsylvania, Virginia; Ontario; Cuba; Porto Rico; Santo Domingo. 
Xanthium echinatum Murr., New York. 
Xanthium inflexum Mackenzie & Bush, Missouri. 
Xanthium italicum Mor. (X. commune Britton, X. glanduliferum Greene), Arkansas, 
California, Colorado, Indiana, Iowa, Nebraska, New Mexico, New York, North 
Dakota, Oklahoma, Pennsylvania, South Dakota; Querétaro; Cuba. 
Xanthium pennsylvanicum Wallr. (X. californicum Greene, X. saccharatum Wallr.), Cali- 
fornia, Colorado, Indiana, Michigan, Missouri, Nebraska, Oklahoma, Tennessee; Cuba. 
Xanthium spinosum I,., Indiana. 
Xanthium sp., Arizona, Delaware, Florida, Idaho, Illinois, Louisiana, Maryland, Massa- 
chusetts, Minnesota, Mississippi, Montana, New Jersey, Ohio, Rhode Island, South 
Carolina, Texas, Washington, West Virginia, Wisconsin, Wyoming; Jalisco, Morelos, 
Oaxaca. 
Type Locatity: North Carolina, on Xanthium strumarium. 
DISTRIBUTION: Canada and the United States east of the Rocky Mountains southward through 
the West Indies, and from central California to southern Mexico; also in Hawaii. 
TEE Ta Ann. Rep. N. Y. State Mus. 25: gl. 2, f. 22; Bull. Lab. Nat. Hist. Univ. Iowa 
32: pl. 2, f. 10a, b. 
Exsiccati: Arth. & Holway, Ured. Exs. Ic. 10a-c; Barth. Fungi Columb. 2678, 2779, 2780, 2781, 
2866, 2901, 3075, 3272, 3375, 3676, 3975, 4576, 4679, 4982; Barth. N. Am. Ured. 74, 175, 279, 375, 
376, 481, 674, 675, 777, 778, 1085, 1276, 1378, 1576, 1577, 1578, 1678, 1781, 1782, 1880, 1978, 2080, 
2081, 2177, 2276, 2277, 2476, 2634; Brenckle, Fungi Dak. 470; Carleton, Ured. Am. 34; Clements, 
Crypt. Form. Colo. 327, 582; Ellis, N. Am. Fungi 264; Ellis & Ev. Fungi Columb. 344, 1456, 1582, 1871; 
Ellis & Ev. N. Am. Fungi 1853; D. Griff. W. Am. Fungi 73, 73a, 82; Kellerm. Ohio Fungi 32; 
Kellerm. & Swingle, Kans. Fungi 17a, 6; Rav. Fungi Am. 730; Rav. Fungi Car. 1: 95, 3: 91; Seym. 
& Earle, Econ. Fungi 322a, b; Shear, N. Y. Fungi 120; Sydow, Ured. 487, 1033, 1087, 1185; Thiimen, 
Myc. Univ. 33 
121. Micropuccinia rotundata (Dietel) Arthur & Jackson. 
Puccinia rugosa Speg. Anal. Soc. Ci. Argent. 17: 92. 1884. Not P. rugosa Billings, 1871. 
Puccinia rotundata Dietel, Hedwigia 36: 32. 1897. 
Dicaeoma rugosum Kuntze, Rev. Gen. 33: 470. 1898. 
QO. Pycnia amphigenous, among the telia, few, gregarious, noticeable, yellowish, globoid 
or somewhat flask-shaped, 125-130 » in diameter; ostiolar filaments not extruded. 
III. Telia amphigenous or chiefly epiphyllous and caulicolous, numerous, crowded on 
yellowish spots in orbicular or somewhat irregular areas 0.5-5 mm. across, roundish, 0.2-0.5 
mm. in diameter, tardily naked, becoming pulverulent, reddish-brown, ruptured epidermis 
conspicuous; teliospores ellipsoid, 18-26 by 30-42, rounded at both ends, occasionally 
tapering below, not or slightly constricted at septum, cells easily separating; wall cinnamon- 
brown, uniformly thick, 2.5-3 », occasionally thickened 4-5 » over each pore, located about 
half way from apex to septum in upper cell and similarly placed between pedicel and septum 
in lower cell, noticeably and evenly rugose; pedicel short, colorless, deciduous. 
This species is correlated with Bullaria inaequata (Jackson & Holway) Arth. & Mains, 
