138 BRITISH MOSSES. 



Plate XX. 



POLYTRICHBiE. 



Fig. 1. Chaeacteeistics of Oedek. 

 Mosses rigid and aloe-like, with long, pointed leaves, long ii-uitstalks and 

 large capsules ; the calyptra, in most species, covered with silky hair (hence the 

 name. Hair-moss) . The summit of the columella (a) is very large, and the teeth 

 (b) are attached to it, the spores, which are large, escaping through them. The 

 hairs of the calyptra (c) are jointed. 



ATRICHUM. 

 Geneeic Chaeactee. 

 Calyptra without hairs ; ,lid with long beak. 



Fig. 2. Ateiohum itndulatum. 



Crane's Billed Moss [a) . 

 Colour. Dark green. 



Stems. One inch long, sometimes branched. 



Leaves (6) . Long and waved, nerved, upper part serrated, lanceolate. 



Flowers and Fruit. Monoicous. Capsule smooth, with long curved beak. 



Spring. 



Locality. Damp places. Common. 



Fig. 3. Atkichum ceispum. 



Wave-leaved Crane's Billed Moss {a) . 

 Colour. Pale green. 



Stems. Half-inch long, slender. 



Leaves {b) . Waved when dry, ovate-lanceolate, serrated, bordered ; very trans- 

 parent, cells large. 

 Flowers and Fruit. Barren when found in Britaia. 

 Locality. Damp places. Not common. 



