EXPLANATION OF TEE PLATES. 119 



II. Leaves without hair-'points. Capsule rather oblique. 



Dioicous. 



Fig. 18. Grimmia unicoloe. 



Dingy Grimmia (a) . 

 Colour. Black. 



Stems. Longj branched, tufted loosely, fastigiate. 

 Leaves (b) . Thick, opaque, margin iuflexed, without hair-points, very obtuse, 



lanceolate. 

 Capsule. Yellow brown, smooth, slightly oblique ; calyptra oblique. Spring (?) 

 Locality. Alpine rocks. 



Fig. 19. Grimmia atrata. 



Tufted Black Gh'immia (a) . 

 Colour. Brownish black. 

 Stems. Branched, more closely tufted. 

 Leaves (h) . Thinner than in the last species ; margin reilexed ; nerve thinner, not 



so obtuse. 

 Capsule. Longer and larger, yellow-brown when young, black when old. Winter. 

 Locality. Alpine rocks. Rare. Clogwyn-y-Garuedd, Snowdon, Glen Callater. 



(" Bryologia Britannica.") 



