EXPLANATION OF TEE PLATES. 



147 



Plates XXII. and XXIII. 



BRYEiE. Part II. 



BRYUM. 



Fig. 1. Generic Character. 



Capsule (a) pear-shaped or oblong, inclined or drooping, never erect, lid pointed 

 or beaked, calyptra small. Peristome double (/>), outer of sixteen teeth, barred, 

 marked with a line down the centre, curving inwards when dry ; inner, a mem- 

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

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

 rows ; areolas (c) rhomboidal. 



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

 Fig. 2. Bryum acuminatum. 

 Sharp -po inted Thread Moss (a) . 



Colour. Yellow green. 



Stems. Branched, with innovations. 



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

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

 Summer. 



Locality. Scotch arid Welsh mountains. 



Fig. 3. Bryum polymorphum. 

 Changeable Thread Moss (a) . 



Colour. Bright green. 



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



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

 serrulate. 



