New species of Uredineae—VI 
JOSEPH CHARLES ARTHUR 
The following fifteen species of rusts are in part new discoveries, 
and in part well known forms that have not before been specifically 
named and characterized. They are placed on record in order to 
facilitate the work of preparation for the systematic treatment of 
the order in the North American Flora, the final parts of which are 
now being written. The kindness of those who have contributed 
specimens is much appreciated. The hearty cooperation of num- 
€erous correspondents tends to insure a reasonably full treatment 
in the forthcoming work. 
Anerror in the preceding number of this series may be pointed 
out here. The type specimen of Uvedo Holwayi (Bull. Torrey 
Club 33: 518. 1906) is on Tsuga heterophylla (Raf.) Sarg. The 
error was due to a confusion in the mind of the writer of the char- 
acters belonging to the two species of hosts. TZ. heterophylla 
is the lowland hemlock, which was formerly referred to the 
eastern 7: canadensis. Both it and the alpine hemlock are found 
in the vicinity of Glacier, B. C. Professor Holway, who was in 
the Selkirks from July to September of 1907, reported the rust at 
the time very abundant on the lowland species, but rare on the 
other. He has sent a specimen on 7: Mertensiana, collected at 
Glacier, B. C., August 18, 1907. 
Puccinia cinerea sp. nov. 
O and I. Pycnia and aecia unknown. - : 
II. Uredinia hypophyllous, scattered, oblong, sma ne 4 
mm. wide by 0.5-1.5 mm. long, tardily naked, pulveru pa 
Orange-yellow, ruptured epidermis conspicuous ; etghe 
broadly ellipsoid, 18-23 x 23-29 #, wall pale-brown, abou i 5 Ly 
thick, finely and inconspicuously echinulate, pores 5 or 6, scatte y 
III. Telia compound, amphigenous, scattered, ag on 
0.1~0.2 mm. wide by 0.5-1 mm. long, long covered by t P 
dermis, cinereous, surrounded by a thin stroma ; teliospores oblong 
or oblong-clavate, irregular by compression, 16-21 X 4 iy 
wall dark cinnamon-brown, I-1.§ /# thick, thicker at apex, 3 5 /; 
Smooth ; pedicel short, tinted. 
583 
