228 ARTHUR: NEW SPECIES OF UREDINEAE 
in plant rusts by Mr. P. L. Ricker, of the Bureau of Plant In- 
dustry, Washington, D. C., who has listed the Uredineae of Maine, 
and is now studying collections from the western United States. 
Uromyces rottboelliae sp. nov. 
X. Amphisori hypophyllous, oblong, prominent, soon naked, 
chestnut-brown, ruptured epidermis noticeable; amphispores 
obovate-globose, 18-25 X 25-30, wall thick, 3 4, golden brown, 
finely and closely tuberculate, pores 4, equatorial, pedicel color- 
less, delicate, about the length of the spore, semi-persistent. 
III. Teleutospores globoid, of about the size and color of the 
amphispores, side wall about 2 » thick, apex much thickened (8 #), 
broad and almost truncate, base rounded, pedicel colorless, deli- 
cate, about the length of the spore, persistent. 
On Rottboellia speciosa Hack. Jaunsar, Northwest Hima- 
layas, India, 7,000 ft. alt., October, 1894 (/. F. Duthie, comm. by 
P. L. Ricker). This species was detected upon specimens in the 
phanerogamic herbarium of the U. S. Department of Agriculture 
by Mr. P. L. Ricker. It is notable for being the first Old World 
species observed possessing amphispores, so far as the writer 
knows. The amphisori have the gross appearance of teleutosori, 
the spores being dark colored and persistent. True uredospores 
were not seen, unless a few spores from parasitized sori were 
such ; they differed from the amphispores only in having thin, 
yellow walls. Nor were teleutosori seen, the spores described 
being scattering ones from amphisori. In North America amphi- 
spores are known in Puccinia vexans Farl., and in a number of 
other species, but in none belonging to the genus Uromyces. 
Puccinia tosta sp. nov. 
O, I. Spermogonia and aecidia unknown. 
II. Uredosori amphigenous, small, brownish yellow, soon 
naked, ruptured epidermis inconspicuous; uredospores globose, 
20-30 » in diameter, wall brownish yellow, thin, about 1.5 / 
closely and minutely tuberculate, pores 6 or more, scattered. 
III. Teleutosori amphigenous, prominent, round or oblong, 
blackish brown, early naked, ruptured epidermis not visible ; teleu- 
tospores globoid to oblong, 20-30 x 30-40 y, rounded at both 
ends, slightly if at all constricted, side walls medium thick, apex 
thickened, 5-10 p, pedicel thick, firm, tinted, once to twice the 
length of the spore, or longer. 
