THE POLYTRICHACEZ OF WESTERN NORTH AMERICA 319 
On soil.—Unalaska, Alaska; Lake Lindeman and Dawson, Yukon; 
Albert Cafion, Selkirk Mountain, British Columbia; eastern British 
America; England. 
6. Polytrichum jensenii Hag., in Saretryk Middel. om Groenl. 
5, Pp. 444, (1898). 
Polytrichum fragilifolium Lindb. fil., in Proc. Soc. pro Fauna et 
Fl. Fenn., Oct. 1900. 

= 
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ent 
ae 
= at 
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pasate 34 

Fig. 24. Polytrichum jensenii. 
1 = Moist plant, X 1. 2 = Dry plant, X 1. 3 = Leaf showing lamelle and 
margin, X 15. 4 = Leaf tip, X 65. 5 = Cross section of leaf showing lamelle, X 
65. 6 = Cross section of a few lamelle, X 250. 
Proc. Wash. Acad. Sci., August, 1910. 
