EXPLANATION OF THE PLATES. 123 



Plate XVII. 



PTTCHOMITEIBtE. 



Characteristics op Order. 



Plants tufted, on rocks ; stems forked (dichotomous) ; branches of equal height 

 (fastigiate) ; leaves lanceolate ; areolae minute ; capsule erect ; beak straight ; 

 peristome single, of sixteen teeth ; calyptra very large, and furrowed ; apex very 

 small. Figs. 1 (ft), 3 (6). 



GLYPHOMITRIOX. 



Fig. 1. Generic Character. 



Minute plants in tufts ; capsule (a) roundish ; beak short ; calyptra (b) large, 

 bladder-like ; peristome (c) inserted below the mouth of capsule ; teeth short and 

 wide, in pairs, with external bars, turned back when dry. 



Fig. 2. Glyphomitrion Daviesii. 

 Black-tufted Moss (a) . 



Colour. Greenish black. 

 Stems. Very short, tufted. 



Leaves (b) . Linear-lanceolate, crisped when dry; nerve strong and thick. 

 Flowers and Fruit. Monoicous. Seta short ; capsule round, entirely covered by 



the calyptra. Summer. 

 Locality. Rocks near the sea. 



PTYCHOMITR1UM. 

 Fig. 3. Generic Character. 



Capsule (a) oval ; beak straight, long ; calyptra (b) very much furrowed, many 

 times divided at the base ; peristome (c) of sixteen teeth, divided almost to the 

 base, the divisions thread-shaped (filiform) ; not affected by damp. 



