424 NORTH AMERICAN FLORA [VOLUME 7 
the pycnia, at first bullate, irregular in form, 0.3-1 mm. in longest diameter, soon dehiscent, 
orange-colored, fading to pale-fuscous when dry, ruptured epidermis overarching, on stems form- 
ing long fissures, 5-15 mm., without producing hypertrophy, pulverulent, distinctly fuscous 
when dry, old fissures more or less closed; peridium wanting; aeciospores fusiform or globoid, 
mostly ovoid-ellipsoid, rounded below, usually somewhat pointed above or even acute, vari- 
able in size, 20-29 by 27-60 n, usually 22-25 by 30-45 4; wall slightly tinted or colorless, 
moderately thick, 2-2.5 y, slightly if at all thicker above, verrucose with rather thickly set 
punctate beads, arranged in more or less evident longitudinal lines, especially toward apex. 
II. Uredinia amphigenous, scattered, abtmdant, roundish, 0.1-0.7 mm. across, at first 
bullate, soon naked, pulverulent, cinnamon-brown, ruptured epidermis usually overarching; 
urediniospores broadly ellipsoid or obovoid, 20-27 by 29-45 uw; wall thin, 1.5-2.5 u, pale cinna- 
mon-brown, finely and closely echinulate, with points 1 or less apart, the pores evident, 
usually large, scattered, about 6. 
III. Telia chiefly hypophytlous, thickly scattered, round, 0.3-0.8 mm. across, soon 
naked, pulvinate, pale cinnamon-brown, or cinerous by germination, ruptured epidermis 
inconspicuous; teliospores oblong, 24-29 by 45-70 n, rounded or obtuse at both ends, some- 
what constricted at septum; wall pale cinnamon-brown, smooth, thin, about 1.5 y, a little 
thicker above, 2-6 u; pedicel colorless, usually inflated up to 25 » in diameter near the spore, 
tapering downward, once to twice length of spore, the wall thin, collapsing upon germination 
of the spore. 
On CARDUACEAE: 
Baccharis coerulescens A. Gray, Hidalgo. 
Baccharis Emoryi A. Gray, California. : 
Baccharis glutinosa Pers., Arizona, New Mexico, Texas; Chihuahua, Michoacan, Oaxaca; 
Guatemala. 
Baccharis viminea DC., California. 
Baccharis sp., Jalisco, Mexico (state). 
‘TYPE LOCALITY: Pasadena, California, on Baccharis viminea. . 
DistRiBUTION: From central California to Texas, and southward through Mexico and Central 
America; also in South America. 
Exsiccati: Barth. Fungi Columb. 4453, 4918, 5015; Barth. N. Am. Ured. 332, 1222, 1333, 1334, 
ae 2117; Ellis, N. Am. Fungi 1078; Ellis & Ev. N. Am. Fungi 2244; D. Griff. W. Am. 
‘ungi . 
241. Dicaeoma pistoricum (Arth.) Arthur & Jackson. 
Puccinia pistorica Arth. Bull. Torrey Club 38:372. 1911. 
Eriosporangium pistoricum Arth. N. Am. Flora 7: 215. 1912. 
O and I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, abundant, scattered, roundish, large, 0.3-0.8 mm. across, 
soon dehiscent, but long covered partially by the overarching epidermis, light cinnamon- 
brown, somewhat pulverulent; urediniospores globoid or obovoid-globoid, 24-32 by 30-39 u; 
wall pale-yellowish or almost colorless, moderately thin, about 2, sparsely and strongly 
echinulate with points about 3 apart, the pores small, very indistinct, probably few and 
scattered. 
III. Telia amphigenous, in compact irregular groups, from punctate to 1 mm. across, 
soon naked, chocolate-brown or blackish, usually shining, ruptured epidermis inconspicuous, 
or in small flecks giving a grayish appearance to the surface, no germination in situ seen; telio- 
spores linear-oblong or oblong-lanceolate, small, 12-16 by 39-50 uw, obtuse or rounded above, 
narrowed below, slightly or not constricted at septum; wall smooth, chestnut-brown above, 
very much lighter toward base, thin, 1-1.5 4, much thickened above, 6-12 u; pedicel 
tinted, slender, 3-5 » in diameter, terete, tapering downward, one half length of spore or less. 
On CARDUACEAE:! 
Baccharis glomeruliflora Pers., Florida. 
Tyre LocALity: Mount Dora, Florida, on Baccharis glomeruli flora. 
DiIsTRIBUTION: Known only from the type locality. 
242. Dicaeoma sphenicum (Arth.) Arthur & Jackson. 
Puccinia sphenica Arth. Bull. Torrey Club 38: 371, 1911. 
Eriosporangium sphenicum Arth. N. Am. Flora 7: 215. 1912. 
O and I. Pycnia and aecia unknown. 
II. Uredinia chiefly hypophyllous, scattered, round, very small, 0.1-0.3 mm. across, at 
