2 LESQUEREUX — CATALOGUE 
that region is studied, the more the number of species is diminished. Having had access 
to a very large number of specimens—thanks to Mr. Bolander’s zeal in collecting—I 
have been able to compare forms from different stations, and to see characters con- 
sidered by others as indicating difference of species, blended together, sometimes 
even on the same specimen. 
To prevent repetition of references, I will merely say that the species mentioned 
from Mr. Mitten, have been published in his Bryologia of the 49th Parallel of Latitude, 
in the Proceedings of the Linn. Soc. of London, Bot., Vol. VIII, —; the species from 
Hampe in a pamphlet, Musei Californici Novi, 1860 ; those of Muller, not included in 
his synopsis, in the Bot. Zeitung, No. 40; those of Sullivant in the Reports of Lieut. A. W. 
Whipple's and Chs. Wilkes’ U.S. Expeditions ; and those of myself in the Transactions of 
the Amer Philos. Soe. of Philadelphia, Vol.15. A few species given with short diagnoses 
in the Musei Exsiecati Americant, Ed. 2d., by Sullivant and Lesquereux, are here copied 
from this work, which has been published in a limited number of copies, and which is 
not therefore accessible to every bryologist. 
As this enumeration is intended as a representation of our actual knowledge of 
the Bryology of the west coast of the United States, I have carefully mentioned the 
habitat of the species, and the names of the botanists who have gathered them. 
Cotumeus, O., 30th March, 1867. 
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