


1901] MEXICAN FUNGI 327 
distinguished from U. Cestri Mont. by the papilla at apex, and by the lines 
on the epispore. 
Uromyces Oaxacanus Diet. & Holw., n. sp.—Sori epiphyllous, 
irregularly scattered (occasionally a sorus on the under side of 
the leaf), small, pulverulent, black; teleutospores ovate, ellip- 
tical or almost globose, frequently angular and irregular, 25-35 
x 18-24; epispore chestnut-brown, not thickened at apex, ver- 
rucose; pedicel hyaline, hollow, somewhat longer than the 
spore. 
On Jatropha urens, Oaxaca, October 21, 1899, no. 3690. 
Uromyces dolichosporus Diet. & Holw., n. sp.— Uredosori 
mostly hypophyllous, scattered, dark brown, partly with spermo- 
gonia on the upper surface of the leaves; uredospores obovate, 
dark brown, 33-47 23-27; epispore thickened at apex and 
often at the base, echinulate, with three germ-pores; teleuto 
sori of medium size, hypophyllous, rarely epiphyllous, scattered 
or in small circular groups, orange-yellow when fresh, becoming 
white and felt-like; teleutospores long-fusiform or long-clavate, 
45-65 X 12-18; with a thin hyaline smooth epispore, and ger- 
minating as soon as mature; pedicel firm, about the length of 
the spore. 
On Tournefortia velutina, Oaxaca, October 18, 1899, no. 3655. 
Uromyces Rubi Diet. & Holw., n. sp.—Spots circular, about 
in diameter, occasionally confluent, yellow ; sori epiphyllous, 
small, white when dry; uredospores elliptical, obovate, or glo- 
bose, 23-35 x 18-25; epispore hyaline, with stout spines ; teleu- 
tospores elliptical or clavate, 26-35 X17-24#, with a very thin 
hyaline epispore; pedicel short; spores germinating at once. 
On Rubus, Cuernavaca, May 17, 1898, C. G. Pringle. 
Tar 
Uromyces PoLyMNIAE (P. Henn.) Diet. & Holw.—Uredo is U. 
Polymniae P. Henn. Teleutosori scattered, hypophyllous, single 
Sori here and there on the upper surface, brownish black, naked ; 
teleutospores elliptical or almost globose to pyriform, sometimes 
