THE POLYTRICHACE^ OF WESTERN NORTH AMERICA 29I 



ovate or somewhat spherical, .012 — .016 mm. — On soil. — Virgin 

 Bay, Orca, Douglas Island, and Wrangel, Alaska; Japan; Kam- 

 chatka. 



Fig. 10. Bartramiopsis lescurii. 



1 = Plant dry, X i. 2 = Moist plant, with capsule, X i. 3 = Moist plant, with- 

 out capsule, X I. 4 = Capsule with lid, not quite mature and therefore slightly 

 shrunken, X 5. 5 = Mature capsule without lid, X 8. 6 = Leaf showing hairs at 

 margin and lamellae on upper side, X 15. 7 = Leaf showing narrower blade and more 

 curved tip, X 12. 8 = Leaf tip, upper side, showing lamellse, X 100. 9 = Leaf 

 tip, under side, X 100. 10 = Cross section of leaf showing 2 layers of cells except 

 near the margin, X 65. 11 = Cross section of a few lamellae, X 250. (Numbers 

 5, 7, 8, 9, after Engler & Prantl.) 



POLYTRICHADELPHUS Mitt. 



Polytrichum is another genus of mosses, adelphos = brother; 

 hence a brother to Polytrichum. 



Plants dioicous, more or less robust, rigid, loosely caespitose. 

 Stems from subterranean rhizomes, erect or inclined, usually quite 

 long, densely leafy, simple or forked or tufted. 



