THE POLYTRICHACEiE OF WESTERN NORTH AMERICA 



327 



Fig. 30. Polytrichum piliferum. 



1 = Moist plant with capsule, X i. 2, 3 and 4 = Dry plants, X i. 5, 6 and 7 = 

 Capsules, X 5. 8 = Capsule with calj^itra, immature, X 5- 9 = Peristome, X 

 150. 10 and 11 = Leaves showing involute margin and lamellie on upper side, X 15. 

 12 and 13 = Leaf tips, X 65. 14 = Cross section of leaf, X 65. 15 = Cross section 

 of a few lamella; showing flask-shaped, somewhat thickened cells, X 250. 



