640 MINNESOTA BOTANICAL STUDIES. 
The western coast of the United States in spring and early 
summer. The following specimens have been examined, the 
first being the type collection: 
On Viola lobata BENTH. 1894, Dunsmuir, Calif. I. iii (4. 
W. D. Holway). 
On Viola Nuttallii Pursu. 1897, Falcon Valley, Wash. I. 
iii (W. MN. Suksdorf ). 
The species is very characteristic. It probably possesses 
spermogonia, but they have not yet been observed; it is, how- 
ever, without uredo, although erroneously included in the orig- 
inal description of the species. Two specimens are cited 
(Erythea 3: 82) as type material, the first on Vzola lobata, re- 
ferred to above, and the second on V7ola ocellata. ‘The latter 
specimen has been examined and proves to be Puccinia Viole, 
and is cited above under that species. The original description 
of the species is accordingly emended to omit the supposed 
uredo. 
The difference in the shape of the spores, shown in the pho- 
tographs of spores taken from the two hosts, is doubtless due 
to some accident of growth, such as more or less compression 
in the young sorus, and is without diagnostic value. It is of 
the same nature as the difference shown in two mountings from 
the same collection of P. Véole on V. cognata. The more 
regular spores are to be accepted in each case as the normal 
development under favorable conditions. 
Four additional species of violet rusts occur in Europe, and 
it is possible that they may eventually be found in this country. 
Uredo alpestris Schreet. inhabits Vola bzflora L., and as this 
host is a native of the Rocky Mountains, the rust may possibly 
accompany it. Puccinia alpina Fckl. also occurs on V. d¢flora 
L., and P. Fergusson Berk. & Br. occurs on V. palustris L., 
and V. méradbilis L., and V. epipsela Led. Both of these 
species belong to the section of Micropuccinia, and are notably 
distinct from the other rusts on violets. A specimen of rust 
collected by Marcus E. Jones at San Diego, Calif., in 1882, 
was erroneously referred to the latter species, and distributed 
by him as No. 3040. Puccinta egra Grove is an autcecious 
species found on the cultivated pansy and its close relatives. 
It will probably be brought to America after a time through 
commercial channels, as the rusts of asparagus, chrysanthe- 
mum, carnation, hollyhock, and of some other cultivated plants 
