230 _ ARTHUR: New SpEcIES OF UREDINEAE 
ences appear to be what might come from a more luxuriant devel- 
opment. Nevertheless the degree and uniformity of divergence 
make it seem the better course to keep this form by itself for the 
present. The wisdom of the course will be shown when a larger 
series of specimens can be examined and cultures made. 
Puccinia aspera Dietel & Holway, sp. nov. 
III. Sporen auf beiden Seiten der Blatter und an den Blatt- 
stielen, bisweilen Verkrimmungen hervorbringend, rundlich, gross, 
nackt, pulverig, kastanienbraun ; Teleutosporen elliptisch oder ob- 
long, in der Mitte schwach eingeschnurt, an beiden Enden abge- 
rundet, an der Basis bisweilen verschmalert ; Epispor am Scheitel 
nicht oder nur wenig verdickt, gelbbraun, von groben unregelmas- _ 
sigen Warzen rauh, 30-42 x 18-24 y; Stiel hinfallig. 
On Saxifraga Mertensiana Bong., Mt. Paddo, Wash., 7,000 ft. 
alt., Aug. 17, 1897 (W. NV. Suksdorf, no. 537). This species re- 
sembles Puccinia Jueliana Diet., but has much larger and more 
pulverulent sori, and somewhat larger and slightly rougher spores. 
The description and part of the type specimen were transmitted to 
the writer by the authors of the species. 
Puccinia turrita sp. nov. 
III. Teleutosori amphigenous, rounded, .5—1 y» in diameter, 
early naked, chestnut brown; teleutospores elliptical or oblong, 
slightly abstricted, 20-24 x 37-48 yw, base rounded, apex acute OF 
obtuse, very coarsely and irregularly tuberculate, especially at the 
apex, pedicel delicate, fugacious. 
On Saxzifraga bronchialis L., Manitou, Colo., Aug. 13, 1888 
(Z. W. D. Holway). The spores of this species are much rougher 
than those of P. aspera D. & H.; they remind one of the rough- — 
ness of the teleutospores of Phragmidium subcorticium Wint. Te 
four saxifrage species, Puccinia Pazschkei Diet., P. Jueltana Diet., 
P. aspira D. & H., and P. turrita, form a series, the spores of all 
being nearly of the same size and general shape, but showing an 
increasing roughness of the surface, and shortening of the pedicel. 
They appear to be distinct species, however, and not mere 
variations of one form. The indications are that all four spect 
are without aecidia and uredospores, but this can not be stated 
positively. 
rely | : 4 
