EXPLANATION OF TEE PLATES. 147 



Plates XXII. and XXIII. 



BRYEiE. Part II. 



BRYUM. 



Fig. 1. Generic Chaeacteb. 



Capsule (a) pear-shaped or oblongs inclined or drooping, never erect, Kd pointed 

 or beaked, caly]3tra small. Peristome double (5), outer of sixteen teeth, barred, 

 marked with a line down the centre, curviag uiwards when dry ; inner, a mem- 

 brane divided into sixteen altematiag parts, having sometimes cilia between. 

 Stems sending out branches (innovaUons) from the summit. Leaves in eight 

 rows ; areolae (c) rhomboidal. 



(a.) Leaves narrow, nerve ceasing below the apex. 



Fig. 2. Beyum acuminatum. 



Sharp-pointed Thread Moss (a) . 



Colour. Yellow green. 



Stems. Branched, with innovations. 



Leaves. Small below, larger above, nerve strong, apex serrated. 



Mowers and Fruit. Monoicous, seta bent at the top ; Capsule horizontal. 



Summer. 

 Locality. Scotch and Welsh mountaias. 



Fig. 3. Betum poltmoephum. 



Changeable Thread Moss (a) . 



ColovjT. Bright green. 



Stems. With innovations, radiculose, half-inch long. 



Leaves (b) . Small below, larger above, oblong-lanceolate; nerve strong ; apex 

 serrulate. 



