4 

the valuable contributions to our knowledge of the 
Lichen-Flora, as well of the coast as of the interior 
mountains, made, during the Mexican Boundary Sur- 
vey, by Mr. Wright and Dr. C. OC. Parry ; for which, as 
for many other, long continued favours, I am indebted 
to Professor Torrey. Alectoria Fremontii is a memori- 
al of the celebrated expedition of Capt. J. C. Fremont. 
Other naturalists who haye contributed to the extension 
of our list are, Dr. F. V. Hayden, (Miss. & Yellowstone 
Expedition) who collected in some of the eastern Val- 
leys.of the Rocky. Mountains; and. Mr. E. Hall. To 
the. careful) observations of, the latter, and to those, a 
season, more recent, of Dr. Parry, almost the whole of 
our scanty. knowledge of the important alpine Flora is 
confined, 
The Coast-Flora, especially of California, is however 
still more interesting than the alpine; and if we except 
some small, collections by Professor Newberry, and, at 
San Diego, by, Dr. J. G. Cooper, it remained still almost 
unexplored, when, Mr. H. N.Bolander, who had already 
devoted himself to the Mosses of the region, collecting, 
says Mr. Lesquereux (Calif. Mosses, in Trans, Amer. 
Phil. Soc.) ‘in less than oneyear . . as many species 
as all the other collectors together,’ turned, happily, his 
attention to the plants before us, 
The intention of this publication is to shew, at the be- 
ginning of careful exploration, exactly what is known 
of the Lichen-Flora of the west coast, south of Van- 
couver's Island; and of the great, western system of 
mountains, within the same range of latitude. Of the 
very extensive alpine districts embraced, nothing is in- 
deed ascertained, illustrating their lichenose vegetation, 
except in the interior ranges; but it is likely that these 
represent, in thisregard, those nearer thecoast. Though 
the deficiences of the list are almost,surprising as the 
