*The Sub-genus Euhypnum 



at the angles ; the inner leaves at the base of the pedicel are 

 deeply folded; small leaf-like organs (paraphyllia) on the stem 

 are few. The spore-cases are cylindrical-oblong on smooth 



Paraphyllia. 



Spore-case with lid. 



H. curvifolium. 



Cells. 



Leaf at base of 



pedicel. Stem-leaf. 



H . imponens. 



pedicels ; the lids are large, from very acutely pointed to 

 convex-conical. The prefix ev, proper, indicates that this 

 sub-genus is the most typical among the different groups of 

 Hypnum. 



Hypnum (Euhypnum) reptile, Michx. See Plate XXVII. 



Habit and habitat. Found in pale- or dusky-green, wide 

 and loose tufts on the bark of living or decayed trees. Com- 

 mon and variable in sub-alpine regions, rare in the plains except 

 northward. 



Name. From the Latin repiilio, creeping. 



Plant (gametophyte). Drooping, stems branching, the 

 branches feather-branched, the branchlets erect and incurved. 



Leaves. Crowded, concave, long taper-pointed from an ob- 

 long base; margin sharply serrate above, flat or recurved below; 

 vein double, short, yellowish; leaf-like organs (paraphyllia) on 

 the stem, few and very small, lance-shaped or palm-like. 



Leaves at the base of the pedicel (perichcetial leaves). The 

 inner long, taper-pointed, longitudinally grooved with double 

 vein and toothed apex. 



299 



