1918] JACKSON—PUCCINIA 305 
at the base, while in the latter it is attenuated. The uredinia in gross appear- 
ance resemble those of Coleosporium. The spores, however, are echinulate and 
borne on pedicels, and sections show urediniospores and teliospores in the same 
sorus. 
18. Puccinia notha Jackson and Holway, sp. nov. 
O. Pycnia epiphyllous, few, gregarious, inconspicuous, sub- 
epidermal, depressed globoid or conical, 60-90 by 50-90 u, ostiolar 
filaments short. 
I. Aecia hypophyllous, few, gregarious on somewhat thickened 
spots, peridium cylindrical, whitish, membranous, rupturing 
irregularly, peridial cells seen only in face view, irregularly poly- 
hedral or rectangular, 18-26 by 35-48 , wall colorless, thin, 1-2 u, 
closely verrucose-rugose; aeciospores somewhat irregularly ellipsoid 
or globoid, 20-26 by 26-35 wu, wall thin 1-1.5 yu, closely verrucose, 
markings somewhat deciduous, pores not evident. 
II. Uredinia amphigenous, few, scattered, round, very small, 
©.I-o.2 mm. across, early naked, pulverulent, whitish, ruptured 
epidermis not conspicuous; urediniospores globoid or obovoid, 
22-26 by 26-32; wall colorless, 1.5-3 thick, moderately 
echinulate; pores obscure. 
III. Telia amphigenous, chiefly epiphyllous, scattered or 
gregarious, small, o.2-0.8 mm. across, early naked, becoming 
pulverulent, blackish brown, ruptured epidermis not conspicuous; 
teliospores broadly ellipsoid, 26-34 by 35-48 », rounded at both 
ends, slightly or not constricted, wall chestnut brown, 3.5-5 # 
thick, slightly thickened by a subhyaline umbo to 7 » at apex and 
Over pore of lower cell which is usually placed near pedicel or half 
way between pedicel and septum, prominently, evenly and mod- 
erately verrucose, with acute points about 3-4 apart; pedicel 
colorless, persistent, firm, once to two and a half times the length 
of the spore, 5-7 u thick, tapering and minutely verrucose at the 
lower end, often attached laterally. 
On Vernonia leiocarpa DC., San Rafael, Guatemala, January 7, 1915, 
Holway 21; Solola, 7000 ft., January 28, rors, I, II, III, Holway 148 (type); 
Antigua, February 4, 1907, Kellerman 6300a; Volcan de Agua, Antigua, 
March 4, 1916, II, III, Holway 550; Guatemala City, February 15, 1916, 
Ill, Holway 409 5; March 17, 1916, III, Holway 585a; Huehuetnango, January 
