EXPLANATION OF THE PLATES. 



101 



Fig. 3. Tortula ambigua. 

 Doubtful Screw Moss (a) . 



Colour. Yellow green. 

 Stems. Short. 



Leaves (b) . Tongue-shaped (Ungulate) , larger than in the last species ; margin 

 incurved. 



Flowers and Fruit. Dioicous. Capsule cylindrical, erect ; calyptra very short ; 



peristome slightly twisted. Winter. 

 Jjocality. Common on walls and banks. 



Fig. 4. Tortula aloides. 

 Aloe-leaved Screw Moss (a) . 



Colour. Yellow green. 

 Stems. Short. 



Leaves (b) . Very rigid, lanceolate, acute ; nerve strong. 



Flowers and Fruit. Dioicous. Capsule oblique, cylindrical ; teeth very slightly 



twisted ; Calyptra short. Winter. 

 Locality. On banks. 



II. Nerve naked, narrow. 

 Leaves lanceolate or narrow. 

 1. Leaves almost straight when dry. 



Fig. 5. Tortula unguiculata. 

 Bird's-claw Screw Moss (a) . 



Colour. Yellow green. 



Stems. Much tufted, branched, longer. 



Leaves (b) . Oblong-lanceolate, obtuse. 



Flowers and Fruit. Dioicous. Capsule nearly cylindrical, erect ; Hd awl-shaped 



(subulate) . Winter. 

 Locality. Banks. 



v 



