422 NORTH AMERICAN FLORA [VoLuME 7 
III. Telia hypophyllous, scattered or gregarious, round, small, 0.2-0.4 mm. across, early 
naked, becoming pulverulent, early-formed sori surrounded by paraphyses as in the uredinia, 
later-formed sori without paraphyses; teliospores broadly ellipsoid, 26-30 by 32-42 nu, rounded 
at both ends, slightly or not constricted at septum; wall chestnut-brown, uniform, 3.5—5 » thick, 
thickened to 5-7 » at apex and over pore of lower cell, which is usually half way from pedicel 
to septum, prominently and evenly tuberculate, with closely set low tubercles, 1 » high, having 
polygonal bases; pedicel short, 5-10 yu, colorless, in large part deciduous. 
ON CARDUACEAE: 
Vernonia leiocarpa DC., Guatemala. 
TYPE LOCALITY: Guatemala City, Guatemala, on Vernonia leiocar pa. 
DIsTRIBUTION: Guatemala. 
237. Dicaeoma Baccharidis-hirtellae (Dietel & 
Holway) Arthur & Jackson. 
Puccinia Baccharidis-hiriellae Dietel & Holway; Holway, Bot. Gaz. 31: 331. 1901. 
Eriosporangium Baccharidis-hirtellae Arth. Résult. Sci. Congr. Bot. Vienne 343. 1906. 
O and J. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, abundant, scattered, round, small, 0.1-0.3 mm. across, at 
first bullate, early naked, pulverulent, cinnamon-brown, ruptured epidermis barely noticeable; 
urediniospores broadly obovoid or globoid, 18-21 by 20-26 u; wall pale cinnamon-brown, thin, 
1-1.5 yw, strongly verrucose-echinulate with points about 3 » apart, the pores obscure, probably 
3 or 4, equatorial. 
III. Telia hypophyllous, abundant, scattered, round, early naked, small, 0.2-0.5 mm. 
across, pulvinate, chestnut-brown, or somewhat cinereous by germination, ruptured epidermis 
inconspicuous; teliospores ellipsoid, 24~30 by 35-42 u, rounded at both ends, or somewhat ob- 
tuse below, slightly constricted at septum; wall minutely verrucose or punctate especially to- 
ward the upper part, light chestnut-brown, concolorous, moderately thick, 1.5-2.5 uw, thicker 
above, 3-7 u; pedicel nearly or quite colorless, terete, slender, 3~5 » thick, about length of spore. 
On CARDUACEAE: 
Baccharis hivtella DC., Mexico (state). 
Tyre Locatity: Amecameca, Mexico, on Baccharis hirtella. 
DistTRIBUTION: Southern Mexico. 
238. Dicaeoma egressum (Arth.) Arthur & Jackson. 
Puccinia egregia Arth. Bull. Torrey Club 38: 370. 1911. Not P. egregia Arth. 1905. 
Erviosporangium egregium Arth. N. Am. Flora 7: 216. 1912. 
Puccinia egressa Arth. Bull. Torrey Club 46: 108. 1919. 
O. Pycnia hypophyllous, preceding the aecia, numerous, especially along the veins, 
punctiform, inconspicuous, honey-yellow, in section flattened-globoid, 140-175 w broad by 
100-130 uv high; ostiolar filaments about 60 » long. 
I. Aecia hypophyllous and caulicolous, abundant, scattered over the whole plant from 
a diffused mycelium, causing etiolation, at first more numerous along the veins and stems, 
bullate, mostly oval, large, 0.5-1 mm. across, the prominent peridium soon bursting through 
the swollen, reddish base; peridium cylindric, or flattened laterally, large, 0.3-0.5 mm. in 
diameter, 0.5-0.8 mm. high, fragile and somewhat evanescent; peridial cells loosely overlapping, 
ellipsoidal in face view, linear-rhomboidal in radial section, 30-50 » long, 10-15 yw across, the 
outer wall thin, about 2 u, smooth, the inner wall somewhat thicker, about 3 py, strongly verru- 
cose; aeciospores broadly ellipsoid or globoid, 16-21 by 19-26 4; wall colorless, thin, 1.5 », 
strongly verrucose with closely set beads. 
II. Uredinia not seen; urediniospores intermixed with the teliospores, globoid, 21-26 by 
24~29 uw; wall cinnamon-brown, rather thin, about 1.5 yu, finely echinulate, the pores indistinct, 
apparently 2 and equatorial. 
III. Telia hypophyllous, scattered, round, usually small, 0,1-0.2 mm. across, early naked, 
loosely pulvinate, becoming pulverulent, chestnut-brown, ruptured epidermis inconspicuous; 
teliospores ellipsoid or obovoid-ellipsoid, 21-27 by 35-45 », rounded or somewhat narrowed 
at base, obtuse or rounded at apex, slightly constricted at septum; wall minutely verrucose or 
punctate, cinnamon-brown, thin, 1.5 », much thickened at apex by a broad, pale umbo, 6-10 u, 
