EXPLANATION OF TEE PLATES. 139 



OLIGOTRICHUM. 



G-ENEEic Character. 



Dioicous ; barren flower cactus-like ; capsule cylindrical ; calyptra with very 

 few erect hairs. 



Pig. 4. Oligotkichum Hercynium: 



Hercynian Hair Moss (a) . 



Colour. Dark green. 



Stems. Shorty not branched. 



Leaves (5) . Few, thick in texture, incurved j lanceolate above, base sheathing ; 



margin curved inwards ; back of nerve sen^ated. 

 Flowers and Fruit. Capsule roundish, contracted below the mouth. Summer. 

 Locality. Common on damp banks, &c. 



POGONATUM. 



Generic Character, 



Stems usually branched, with an imderground stem (rhizoma) ; leaves stiff; 

 base sheathing ; nerve strong. Dioicous. Barren flower, cactus-like ; capsule 

 on long seta, rounded, regular ; calyptra covered with hair. 



Fig. 5. Pogonatum nanum. 



Dwa,rf Hair Moss (a) . 



Colour. Dark green. 



Stems. Not branched, short. 



Leaves. Few, incurved, very minutely toothed at the summit, obtuse. 



Moiuers and Fruit. Capsule roundish, small ; columella not winged. Autumn. 



Locality, Common on damp banks. 



