3IO 



FRYE 



Fig. 18. Polytrichum gracile. 



1 = Moist plant with capsule, X i. 2 = Dry plant, X i. 3 = Capsule, X 5. 

 4 = Peristome, X 150. 5 = Leaf showing lamella; on upper side, X 15. 6 = Leaf 

 tip, X 65. 7 = Cross section of leaf showing lamclhe, X 65. 8 = Cross section of 

 a few lamellae showing smooth marginal cells, X 250. 



