*f 
any exclusively Eastern North American: genus and the scarcity of 
species typical of that region in Western North America, have, 
years ago, been pointed out by the above author as one of the most 
curious and interesting facts relating to the geographical distribu- 
tion of mosses on this continent. * 
Two species of Hypnum, H. orthocladum and Hf letum, are known 
at present as the sole representatives of typical Eastern North 
American forms. ; 
According to the enumerations in that work, of the two hundred 
and sixty-five species known from the Pacific coast of North 
_ America, one hundred and twenty-two are mentioned as_having 
been found in Oregon. Included are those collected in Vancou- 
ver’s Island (which is to be considered within the limits of the same 
botanical province) by Lyall, and the few species from the British 
possessions by the older English collectors, which may safely be 
expected to be met with in the mountainous and northern parts of 
the State. Adding the Fontinalis antepyretica, var. Neo Mexicana, 
-Sulliv and Lesq., lately found by Dr. Barret in the Hood river, O., 
and the three new species introduced here, the whole number of 
Species known at present from Oregon would be one hundred and 
_ twenty-six (eighty-four acrocarpous and forty-two pleurocarpous). 
Of this number, eighty-six, or nearly seventy per cent., are European 
Species (sixty-seven acrocarpici and twenty pleurocarpici). Fifty- 
three of the same are also common in Eastern North America, 
mostly of a wide distribution in the temperate and colder zones of 
the globe. Eighteen are common to Europe and California,’and 
fitteen European species have yet been found on this continent 
solely in Oregon, the greatest part typical European forms be- 
_ longing to the more temperate zones of Europe, as, v. 2. : Dicranum 
albicans, D. strictum, Leptotrichum flexicaule, Barbula princeps: 
(LB. Mulleri, Breh), Tayloria serrata, Bryum longicollum and 
Mnium medium. : sar 
_ The number of exclusively Western North American species 1s 
thirty-seven, or thirty per cent (sixteen acrocarpous and twenty- 
one pleurocarpous). : 
Of these, the following nineteen can be regarded as peculiar to 
the moss flora of Oregon. Barbula rubiginosa, Grimia cDEype: 
— don) Wevit (inter Racomitrium). Zygodon ceespitosa trom p 
couver Island, Orthotrichum consimile and O. Columbianum from 
the same locality, Mniwm Neviz, Bryum Oreganun, Dichelyma 
uncinatum, Hookeria anomala, Hypnum laxifolium H. reniol- 
ifolium, H. apocladum, H. lentum, H. declivum, H, Oreganum, + 
turfaceum, H. robustum, H. collinum, Schw. (sterile from Califor- 
nia) H. pseudo-sericeum, 7. sp., C. Mill. 
Pe Sa 
* Transactions of the’American Philosophical Society, Phila., June, 1862. 
