THE POLYTRICHACE^ OF WESTERN NORTH AMERICA 



319 



On soil. — Unalaska, Alaska; Lake Lindeman and Dawson, Yukon; 

 Albert Caiion, Selkirk Mountain, British Columbia; eastern British 

 America; England. 



6. Polytrichum jensenii Hag., in Saretryk Middel. om Groenl. 



i5> P- 444, (1898). 

 Polytrichum fragili/olium Lindh. fil., in Proc. Soc. pro Fauna et 

 Fl. Fenn., Oct. 1900. 



Fig. 24. Polytrichum jensenii. 



1 = Moist plant, X i. 2 = Dry plant, X i. 3 = Leaf showing lamellae and 

 margin, X 15. 4 = Leaf tip, X 65. 5 = Cross section of leaf showing lamellas, X 

 65. 6 = Cross section of a few lamellae, X 250. 



Proc. Wash. Acad. Sci., August, 1910. 



