Notes on some western Lichens 
R. S. WiLtrams 
Having occasion recently to write up the labels for a collec- 
tion of lichens made in the Yukon region, in the years 1898 and 
1899, and also for a small collection I made chiefly in the Blackfeet 
Indian Reservation of northern Montana, in the summer of 1897, 
I found a number of unnamed species and also various corrections 
which it seemed to me might be made. 
SPECIMENS FROM YUKON 
The Yukon specimens were often in none too great quantity 
as they were picked up as occasion permitted without any previous 
preparation for that line of work. Duplicates of most of the 
Yukon collection I sent to the late T. A. Williams, of Washington, 
and to Miss Cummings, of Wellesley, and perhaps two thirds of 
these were determined by Mr. Williams, but no list published. 
Some years later another not very complete set was sent to Dr. 
R. Heber Howe and of these, determinations, partly made by Dr. 
Hasse, were published in the Bulletin of the Torrey Botanical 
Club (38: 287-293. 1911). 
I now find in going over the original collection a number of 
species not seen by Dr. Howe and also some discrepancies owing, 
doubtless, partly to mixtures, lack of material or poor specimens. — 
I shall first mention the Yukon plants not sent to Dr. Howe. 
They are the following well-known and widely distributed species: 
LECIDEA DECIPIENS (Ehrh.) Ach. 
Dawson, on rock, April, 1899 (49). 
LECIDEA GRANULOSA (Ehrh.) Poetsch. 
Hills above Lake Lindeman, May, 1898 (50). 
CLADONIA PYXIDATA (L.) Hoffm. 
Lake Lindeman, May, 1898 (4a). 
RHIZOCARPON GEOGRAPHICUM (L.) Lam. & DC. 
Dawson, April, 1899 (82). 
