The Sub-genuS Euhypnum 



Lid (operculum). Convex, with an oblique point, orange 

 at the apex. 



Teeth (peristome). Inner segments slightly cleft and as long 

 as the cilia; outer, normal, cilia single, with small transverse 

 spurs attached to the margin. 



Annul us. Large, compound, adherent to the mouth. 

 Spores. Mature in the autumn. 



Distribution. Common in sub-alpine America, 

 rare in Europe. 



Spore- case 

 with peristome. 



Spore-case 

 with lid. 



H. imponens. 



Portion of peristome 

 showing on the left two 

 outer teeth; on the right 

 two inner teeth and two 

 cilia. 



Hypnum curvifolium, Hedw. See Colour Plate XVI. 



Habit and habitat. This attractive moss grows in intricate 

 tufts, yellowish-green and glossy. It is very common on 

 decayed logs in shady woods. 



Stem. 



Branch-leaves. 

 H. curvifolium. 



303 



Cells. 



