1905] ARTHUR—RUSTS ON COMPOSITAE FROM MEXICO 199 
thickly scattered, irregularly roundish, o.5™™ or less across, long 
covered by the grayish epidermis; teleutospores obovoid, more or less 
angular, 20-25 by 24-36, obtuse or rounded at apex, narrowed at 
base, wall golden-brown, rather thin, 1-24, much thicker at apex, 
3-64, concolorous; pedicel nearly colorless, thick, two-thirds length 
of spore or less. 
On Senecio Roldana DC., Amecameca, Oct. 20, 1903, no. 5183 (type), Oct. 
31, 1899, no. 3752: Cacalia sp., Patzcuaro, Oct. 20, 1898, no. 3182. 
The morphological characters and gross appearance of this species closely 
resemble those of Puccinia senecionicola, except that the teleutospores are one- 
celled instead of two-celled. A very few uredospores were seen, which resembled 
those of P. senecionicola closely, except that they were quite colorless, which may 
have been due to weathering, or to their origin in teleutosori as an obsolescent 
form of spore. A single group of hypophyllous aecidia was also found, accom- 
panied by epiphyllous spermogonia, but too old for securing accurate 
characterization 
15. UROMYCES CUCULLATUS Syd. 
On Zexmenia sp., Iguala, Oct. 4, 1900 (C. G. Pringle): Perymenium Ber- 
landieri DC., Amecameca, Oct. 31, 1899, no. 3753: P. verbesinoides DC., Cuer- 
Ravaca, Sept. 30, 1898, no. 3116: P. Mendezii DC., Pachuca, Oct. 5, 1899, 
No. 3578, Oct. 28, 1903, no. 5257: P. discolor Schrad., Oaxaca, Nov. 10, 1903, 
NO. 5362, Noy. 14, 1903, no. 5417. 
16. Puccinia senecionicola, n. sp.—Uredosori amphigenous, some- 
what Stegarious or solitary, round, small, tardily naked, pulverulent, 
“imamon-brown, ruptured epidermis noticeable; uredospores glo- 
boid, 24-27 by 25-324, wall cinnamon-brown, thin, sparsely and 
Strongly echinulate, pores 2, opposite in the equator: teleutosori 
hypophyllous, thickly scattered and somewhat confluent, punctiform 
or bullate, long covered by the epidermis; teleutospores oblong or 
oblong-clavate, 16-27 by 42-60, obtuse, truncate or even rounded 
on and often oblique, more or less narrowed at base, slightly or 
a a sige at septum, wall golden-brown, sometimes darker 
Aas ? a ~ thin, little to much thickened at apex, 3-12, con- 
Tous; pedicel short, nearly colorless. 
eg oe DC., Amecameca, Oct. 20, 1903, no. 5189 (type), 
- 3762; Pachuca, Oct. 6, 1899, no. 3586, Oct. 28, 1903, no. 
i Fick bs, a. aa, 1899, no. 3714; Nevada de Toluca, 10,500" gernes 
| Pringles Wass . Sinuatus HBK., Pachuca, Oct. 28, 1903, se 5252: : 
» Zapotlan, State of Jalisco, Oct. 9, 1903, no. 5143: C. ampullacea 
