ARTHUR: NEW SPECIES OF UREDINEAE 371 
large, 0.5-I mm. across, the prominent peridium soon bursting 
through the swollen reddish base; peridium cylindrical, or flat- 
tened laterally, large, 0.3-0.5 mm. in diameter by 0.5-0.8 mm. 
high, fragile and somewhat evanescent; aeciospores broadly 
ellipsoid or globoid, 16-21 by 19-26y; wall colorless, thin, 1.5, 
strongly verrucose with closely set beads. 
Uredinia not seen; urediniospores mixed with the telio- 
spores, globoid, about 23-27 in diameter; wall cinnamon-brown, 
rather thin, 1.5u, finely echinulate, pores indistinct, apparently 
2 and equatorial. 
III. Telia hypophyllous, scattered, round, usually small, 
0.I-0.2 mm. across, early naked, loosely pulvinate, becoming 
pulverulent, chestnut-brown; teliospores ellipsoid or obovate- 
ellipsoid, 21-27 by 35-45u, rounded or somewhat narrowed at 
base, obtuse or rounded at apex; wall cinnamon-brown, minutely 
granular, 1.54 thick, much thicker at apex by a broad pale umbo, 
6-10u, often appearing vertically striate; pedicel colorless, delicate, 
short. 
On Baccharis oaxacana Greenm., Mt. Oaxaca, Mexico, alt. 
2850 m., June 23, 1894, C. G. Pringle. Through the kindness of 
Mr. A. B. Seymour, I was enabled to examine the large original 
collection of this species. The host was determined at the Gray 
Herbarium in February 1911. The aecial mycelium causes a 
marked change in the host, turning it pale and giving a drawn 
appearance. The sporophytic stages appear sparingly on the 
least changed leaves. 
Puccinia sphenica sp. nov. 
O and I. Pycnia and aecia unknown. 
II. Uredinia chiefly hypophyllous, scattered, round, very 
small, light cinnamon-brown, pulverulent, ruptured epidermis 
noticeable; urediniospores broadly obovoid, 19-23 by 24-—30p; wall 
tawny or nearly colorless, 1.54 thick, minutely and rather closely 
-echinulate, pores indistinct, 3 or 4, equatorial. 
III. Telia hypophyllous, scattered, small, pulvinate, chestnut- 
brown, ruptured epidermis inconspicuous; teliospores ellipsoid, 
27-32 by 35-45u, rounded at both ends; wall smooth, chestnut- 
brown, concolorous, 2.5-4u thick, thicker above, 4-9u; pedicel 
often inserted obliquely, nearly or quite colorless, terete, frag- 
ile, about once length of spore. 
On Baccharis sordescens DC., Cuernavaca, State of Morelos, 
Mexico, Oct. 29, 1903, E. W. D. Holway 5266. From other North 
