112 TWENTY-FIFTH REPORT ON THE STATE MUSEUM. 
-brown ; spores somewhat irregular, .001—.0013' long, .0006'—.0007 
broad. 
Leaves of Clintonia borealis. Adirondack Mts. July to Sep- 
tember. 
The sori normally occur on the upper surface of the leaf, but 
there are usually a few on the lower surface. I have seen no 
description of this species, and depend upon the authentication of 
my specimens by Rev. M. A. Curtis for the correctness of their 
reference. 
3. P. Viotarum Lk. Violet Brand. 
Hypogenous ; spots yellowish ; sori small or minute, clustered or 
scattered, at first covered by the epidermis, then surrounded by its 
ruptured remains, brown; spores broadly elliptical, -.001’—.0013 
long, .0008—.0009' broad. 
Leaves of violets. Common. July to September. 
A form with the sori minute and scattered over the whole under 
surface of the leaves occurs on Viola pubescens. The Uredo form 
of this species is Z7zchobasts Violarum Lev. 
4. P. Myrruis Schw. 
Amphigenous; spots pallid or yellowish, sometimes none; sori 
small, scattered or loosely clustered, blackish-brown ; spores broadly 
elliptical, .001’—.0013' long, .0008' broad. 
Leaves of sweet cicely, Osmorrhiza brevistylis and O. longistylis. 
Our specimens do not agree strictly with the perplexingly brief 
description of Schweinitz, but they can scarcely be more than a 
mere variety, differing in the color of the spores and sometimes in 
the presence of spots on the leaves. The species is very close to 
the next, differing chiefly in the smaller size of the spores, a dif- 
ference which extends also to the Uredo form. 
5. P. Umereriirerarum DC. 
Amphigenous; spots none; sori small, scattered, dark-brown ; 
spores somewhat irregular, slightly constricted, sometimes narrowed 
toward the base, .0013—.0016' long, .0008' broad. 
Leaves of Archangelica atropurpurea. NorthGreenbush. July 
to September. 
The dull color of the sori causes the leaf to appear as if mottled 
with numerous small areas of dead tissue. The spores in our spe- 
cimens agree exactly with those of European specimens. T7richo- 
basis Umbellatarum Lev. is the Uredo form. 
6. P. vartasmis Grev. Variable Brand. 
Amphigenous; spots none; sori small, scattered, subrotund, 
surrounded by the ruptured epidermis, blackish-brown ; spores 
