576 ARTHUR: NEW SPECIES OF UREDINEAE 
to the genus Uropyxis. The collection was made too late in the 
season to show characters of the sori well. The teliospores, how- 
ever, were present in great abundance, but on leaves thickly 
covered with the bright yellow uredinia of Pucciniastrum A gri- 
moniae, among which the teliospores of the Uropyxis were con- 
spicuous on account of their dark color. Owing to the slight 
development of the gelatinous layer, the teliospores might easily 
be mistaken for those of some Puccinia. The presence of more 
than one pore in each cell, however, together with correlated but 
less decisive characters of wall and pedicel, and especially the 
arrangement of the uredinial pores in zones, leaves no place for 
doubt that this is correctly assigned to the genus Uropyxis. The 
species should follow the second one mentioned under that genus 
in the North American Flora 7: 155. 1907. 
Uredo Spirostachydis sp. nov. 
II. Uredinia caulicolous, scattered, round or roundish, 0.4- 
0.8 mm. across, soon naked, usually pulvinate and only moderately 
pulverulent, cinnamon-brown, ruptured epidermis conspicuous; 
urediniospores ellipsoid or oblong, 18-21 by 23-29u; wall dark 
golden brown, closely and rather coarsely echinulate, moderately 
thick, 2-2.5u, pores 6-8, scattered. 
On Spirostachys occidentalis S. Wats. (Allenrolfea occidentalis 
Kuntze), north of Yuma, Ariz., April 26, 1906, Marcus E. Jones 
7815. The microscopic characters of the spores are in close accord 
with those of Uromyces Chenopodii (Duby) Schrét., as represented 
by Kunze, Fungi Selecti Exsiccati 274), but in the absence of 
teliospores it is unwise to use that name or that of any other 
European species. A name and description are supplied for this 
collection to call the attention of western mycologists to the 
species. It will doubtless be found also to possess aecia, appearing 
very early in the season in such localities as have favored the 
formation of telia at the close of the previous season. The suc- 
culent stems of the host are well covered with the rusty-colored 
sori, and the telia when discovered will probably have a similar 
appearance, but probably a little darker. 
Uredo Beloperonis sp. nov. 
II. Uredinia amphigenous and caulicolous, scattered, some- 
times circinate, roundish or elongated, large, 0.5-2 mm. across, 
