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, Musci California Nov i, 1860 ; those of Muller, not included in 

 his synopsis, in the Bot, Zeitung, No. 40 ; those of Sullivant in the Reports of Liezit. A. W. 

 Whipple's and Chs. Wilkes' U. S. Expeditions; and those of myself in the Transactions of 

 the Amer Philos. Soc. of Philadelphia, Vol, 13. A few species given with short diagnoses 

 in the Musci Exsiccati Americani, 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. 



Columbus, O., 30th March, 1867. 



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