-89- 



ing form tending to take on a snufif-colored pigmentation, and the branch-leaves 

 are not so markedly undulate as is commonly the case with 5. recurvum. The 

 branch-leaves tend to be considerably more porose on the outer surface than 

 in the parent species, the stem-leaves are relatively large, and broad in proportion 

 to their length (Ungulate), and the stem-cortex is differentiated off as in 5. pulch- 

 rum, or even more distinctly so. The species is one of the far north, being 

 known in North America from Greenland and Alaska. The Alaskan collection 

 was made by Trelease at Port Wells in 1899.^0 I have a bit of the material from 

 the herbarium of the New York Botanical Garden, and would agree with Warn- 

 storf in its identification. I have also seen a specimen from Greenland in the 

 herbarium of the Copenhagen Botanical Museum which seems to represent the 

 species. It was collected by Kruuse (not Krause, as Warnstorf has it) in 1902 

 in the Scoresby Sound region. In Europe it belongs primarily to the north, 

 though Warnstorf reports it from as far south as the Alps. It has also been 

 collected in Siberia. 



Apparently next related to this species is S. annulatum H. Lindberg, 1898, 

 described from Finland. It is of similar appearance, rather coarser and more 

 robust and distinguished particularly by the astonishing development of pores 

 in the branch-leaves, approximating in this respect S. suhsecundum or 5. men- 

 docinum. H. Lindberg was led by minor variations to make two other species, 

 <S. Jensenii 1899 and 5". propinquum 1903 out of his material. They have been 

 reunited, I have no doubt correctly, by Warnstorf in 1911,21 though under the 

 name S. Jensenii which lacks priority. I refer to this species because there 

 is every reason to expect that it will be found in extreme northern North Ame- 

 rica. In Europe it is confined to the far north; it is also known from Siberia. ^2 



If I may revert for a moment to the group Squarrosa, it will be recalled 

 that I was previously not able to include Pennsylvania in the list of states rep- 

 resenting the southern limit of distribution of S. teres. At about the same time 

 Dr. Jennings published its occurrence in that state^"^ near Linesville in Crawford 

 County, and has kindly sent me a specimen from this collection. The locality 

 falls within the limits of glaciation. It would be of decided interest if data suf- 

 ficient could be secured to show just where various species of Sphagnum reach 

 their southern limit of distribution in Pennsylvania and in just what relation 

 this limit stands to the limit of glaciation. The same is of course true of other 

 states across the country. 



Ithaca, N. Y. 



19 Reports of Warnstorf (Pfianzenreich, 51: 227. 1911) from Labrador and New Hampshire 

 I cannot verify. 



20 Cf. Harriman Alaska Expedition, V, 332. 1904; Warnstorf mentions other collections from 

 Alaska. 



21 Pfianzenreich, 51 : iggff. 



22 Warnstorf 's locality for Japan should be confirmed. 



23 Mosses of Western Pennsylvania, 33. 19 13. 



