2pO CARDOT AND THI5RIOT [33] 



compositis, cellula apicali majore, profunde emarginata. Caetera 

 ignota. 



From Yukon River (W. H. Dall, in 1867). 



This species is easily distinguished from the smaller forms of P. 

 commune by its short and entire leaves, its higher lamellae with more 

 deeply crenated borders and more strongly emarginated marginal cells. 



A recently described species, P. jensenii Hagen {P. fragilifolium 

 Lindb. fil. mss.), which has been found in Greenland, Spitzbergen, 

 Lapland and Wyoming, comes very near our P. yukonense by its 

 size and the height and structure of its lamellae, but differs from it by 

 its leaves being longer and dentate at the point, by the cells of the 

 basilar and subvaginant part, which are wider, and by the much less 

 emarginated apical cells of the lamellae. 



Polytrichum juniperinum Willd. Fl. berol. prodr., p. 305. 



From New Metlakatla (Trelease, 1678^) ; Point Gustavus (Coville 

 and Kearney, 772 in part) ; Kodiak (Trelease, 1674, 1696) ; Long 

 Island (Trelease, 1697); Port Clarence (Trelease, 1666, 1667, 1668; 

 Brewer and Coe, 670 ; L. J. Cole). 



Numbers 1667, 1668 of Trelease, and 670 of Brewer and Coe con- 

 stitute a form near var. alpinum Sch. 



Polytrichum strictum Banks apud. Menz. in Trans. Linn. Soc., iv, 



p. 77, pi. 7, f. i. 



From New Metlakatla (Trelease, 1659) ; Wrangell (Coville and 

 Kearney, 414); Virgin Bay (Trelease, 1672, 1673; Coville and 

 Kearney, 1237); Sitka (Trelease, 1671, 1687; Coville and Kearney, 

 893) ; Kodiak (Trelease, 1675). 



Polytrichum hyperboreum R. Brown in Parry voyage, Suppl., p. 294. 

 P. boreale KINDB. in Mac. Cat. Can. pi., vi, Musci, p. 155. 



From St. Paul Island (J. M. Macoun) ; Plover Bay, Siberia 

 (Coville and Kearney, 1860 in part). 



It is impossible to distinguish from P. hyperboreum R. Br. the P. 

 boreale of Kindberg, the characters mentioned by the author for the 

 latter having no stability, even on the original specimens he has com- 

 municated to us. 



P. sexangulare Fl., P. piliferum Schreb. and P. behringianum Kindb. have 

 been reported by Kindberg from Alaska and the islands of Bering Sea. 



Family FONTINALACE^E. 



Fontinalis patula Card, in Rev. bryol., 1896, p. 67. 

 From Sitka (Trelease, 2368). New to Alaska. 



