310 FRYE 

Fig. 18. Polytrichum gracile. 
1 = Moist plant with capsule, X 1. 2 = Dry plant, X 1. 3 = Capsule, X 5s. 
4 = Peristome, X 150. 5 = Leaf showing lamelle on upper side, X 15. 6 = Leaf 
tip, X 65. 7 = Cross section of leaf showing lamelle, x 65. 8 = Cross section of 
a few lamelle showing smooth marginal cells, X 250. 
