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ARTHUR: NEW SPECIES OF UREDINEAE 7 
On Althaea rosea L. (type), Callaway, Nebraska, July 1, 1902, 
J. M. Bates. On Malvastrum coccineum (Pursh) Gray, Wakeeney, 
Kansas, June 15, 1903, and Callirrhoe involucrata (Nutt.) Gray, 
Rooks County, Kansas, May 31, 1902, &. Bartholomew. There 
are three species of Aectdium occurring upon various malvaceous 
hosts found on the western plains. It is not difficult to dis- 
tinguish them. <Aectdium tuberculatum E. & K. has very large 
aecidial cups of a bright orange color when fresh, Ae. ma/vi- 
cola Arth, has average-sized aecidial cups also orange-colored 
when fresh, and de. Napaeae A. & H. (of which Ae. Calhirrhoes 
E. & K. is a synonym) has slightly smaller aecidial cups which are 
nearly or quite colorless even when fresh. Beside these, Ae. roes- 
telioides E. & E. of Texas has orange-red aecidial cups, the margins 
of which are slit into long spreading filaments that appear yellow. 
Aecidium occidentale sp. nov. 
O. Spermogonia amphigenous, in small groups, crowded, rather 
prominent, honey-yellow, punctiform, wholly immersed, subepi- 
dermal, in vertical section globose or somewhat depressed, 110- 
150y in diameter; ostiolar filaments free or somewhat aggluti- 
nate, 30-75 yw long. 
I. Aecidia hypophyllous, in circular or sometimes elongated 
groups, rather crowded, broad and low; peridia pale, margin 
erect, erose; aecidiospores globoid, 18-24 by 23-294; wall 
medium thick, 2.5—3 », colorless, closely and finely verrucose. 
On Clematis Douglasii Hook., Pullman, Washington, June 2, 
1894, zo. 499 (type), and June, 1893, wo. 132, C. V. Piper; Pull- 
man, Washington, June, 1892, V. Rk. Hull; Moscow, Idaho, May 
30, 1897, L. F., Henderson, no. 4326; Helena, Montana, June 5, 
1880, -. D. Kelsey. This species is distinguished from Ae. Clema- 
tidis DC.,, which occurs in the same region, by its somewhat 
smaller and more delicate aecidial cups and spores. The aecidia 
are also more diffusely grouped, and the spermogonia more prom- 
inent. The fungus does not appear to thicken the leaf materially, 
or produce distortions. 
Aecidium recedens sp. nov. 
O. Spermogonia amphigenous, few, in small circular groups, 
punctiform, honey-yellow, wholly immersed, subepidermal, in ver- 
tical section globose, go-110 in diameter; ostiolar filaments 
454 long. 
