600 NORTH AMERICAN FLORA [VoLuME 7 
over pore of lower cell at septum, smooth; pedicel colorless, fragile, once length of spore. 
On CaRDUACEAE: 
Parthenium argentatum A. Gray, Zacatecas. 
Parthenium Hysterophorus L., Mexico (state); Bermuda. 
Parthenium incanum H.B.K., Texas. 
TypPE Locality: Tecuma4n, Cérdova, Argentina, on Parthenium Hysterophorus. 
DistRiBuTIoNn: Southern Texas to southern Mexico; Bermuda; also in South America. 
30. Puccinia vaga H. S. Jackson, Mycologia 14: 112. 1922. 
IL. Uredinia hypop byllous, becoming somewhat amphigenous, scattered, round, small 
0.2-0.4 mm. in diameter, early naked, pulverulent, cinnamon-brown, ruptured epidermis 
conspicuous; urediniospores globoid or broadly obovoid, 21-24 by 23-26 uw; wall light cinna- 
mon-brown, thin, 1-1.5 4, moderately and prominently echinulate, the pores 2, opposite 
and equatorial. 
III. Telia amphigenous, scattered, round, small, 0.2-0.5 mm. in diameter, early naked, 
pulvinate, becoming somewhat pulverulent, blackish-brown, ruptured epidermis evident; 
teliospores broadly or narrowly ellipsoid, 23-26 by 27-48 n, rounded at both ends, slightly 
constricted at septum; wall reddish chocolate-brown, concolorous, medium-thick, 3-4 y, 
slightly thicker above, 4-6 u; pedicel colorless, about twice length of spore. 
On CaRDUACEAE: 
Verbesina sp., Morelos. 
TYP LocaLity: Cuernavaca, Mexico, on Verbesina sp. 
DistRIBsUTION: Known only from the type locality. 
31. Puccinia Melantherae P. Henn. Hedwigia 36: 214. 1897. 
II. Uredinia hypophyllous, round, smail, 0.1-0.3 mm. in diameter, early naked, pulver- 
ulent, dark cinnamon-brown, ruptured epidermis noticeable; urediniospores globoid, obovoid, 
or triangular, 19-22 by 19-24 4; wall golden-brown, 1-1.5 » thick, moderately echinulate, the 
pores 2, approximately equatorial. 
III. Telia hypophyllous, round, 0.5—0.8 mm. in diameter, early naked, pulvinate, becoming 
somewhat pulverulent, blackish-brown, ruptured epidermis noticeable; teliospores ellipsoid, 
20-26 by 32-38 wu, rounded above and below, noticeably constricted at septum; wall chestnut- 
brown, 1.5—2.5 « thick, somewhat lighter and thicker above, 4-6 uw, smooth; pedicel colorless, 
flexuous, twice length of spore, or more commonly shorter. 
ON CaRDUACEAE: 
Melanthera nivea (,.) Small, Guatemala. 
TYPE LOCALITY: Santa Catharina, Brazil, on Melanthera deltoidec. 
DISTRIBUTION: Central Guatemala; also in South America. 
32. Puccinia globulifera Arth. Bot. Gaz. 40: 200. 1905. 
II. Uredinia hypophyllous, round, small, 0.2-0.3 mm. in diameter, scattered, early naked, 
pulverulent, cinnamon-brown, ruptured epidermis inconspicuous; urediniospores globoid, 
small, 15-18 w in diameter; wall moderately thick, 2 u, cinnamon-brown, closely and strongly 
echinulate, the pores 2, approximately opposite in the equator. 
III. Telia amphigenous, round, small, 0.2-0.3 mm. in diameter, scattered, early naked, 
somewhat pulverulent, blackish, ruptured epidermis inconspicuous; teliospores broadly 
ellipsoid, 22-25 by 24-32 u, semiopaque, rounded at both ends, not constricted at septum; 
wall dark chocolate-brown, uniformly thick, 3 u, closely and evenly aculeate with strong, 
conic points; pedicel colorless except near the spore, slender, firm, 5-6 w thick, twice length 
of spore or longer, the place of insertion usually at or near the septum. 
On CaRDUACEAE: 
Otopappus epaleaceus Pringlei Greenman, Guerrero. 
Type Locality: Iguala, Mexico, on Otopappus epaleaceus Pringlet. 
DistRIBUTION: Known only from the type locality. 
Exsiccatr: Barth. N. Am. Ured. 143. 
33. Puccinia Zaluzaniae Arth. Bot. Gaz. 40: 205. 1905. 
I. Uredinia.chiefly epiphyllous, scattered, round, small, 0.3 mm. or less in diameter; 
