14 GLIDE TO CRYPTOGAMS. 



Pogonatum. Plants gregarious, short and simple or robust 

 and long with dendroid ramification. Leaves open, unaltered by 

 moisture, eosta covered with numerous lamellae, occupying much 

 of the lamina, rendering the leaves hard and coriaceous, margin 

 spinulose serrate. Capsule oblong, cylindrical, erect or cer- 

 nuous. Teeth orange in the middle. Calyptra cucullate, very 

 hairy. 



5 d. Teeth 64. 



Polytrichum. Plants growing in wide and large tufts, from 

 radiculose creeping shoots. Stems erect, simple, woody, trian- 

 gular, the male plants proliferous from the middle of the flowers. 

 Leaves as in Pogonatum, with a broad costa. Capsule quad- 

 rangular or rarely hexagonal, with a short sub-globose or 

 discoidal apophysis. Teeth attached by their points to the 

 membrane-like top of the columella. Lid large, flat, convex or 

 conical, with a straight beak. Calyptra cucullate, covered with 

 long, hanging hairs. 



4 b. Peristome doable. 

 1G a. Liner peristome a plaited cone. 

 17 a. Capsule on a thick stalk. 



Buxbaumia. Plants very small, growing on soil or on de- 

 caying wood. Leaves split into inconspicuous hairs at the base 

 of the stalk. Capsule oblique-ovate or ovate oblong, ventricose, 

 flattened on one side, on a solid erect neck ; stalk red. Peri- 

 stome much as in Diphyscium. Lid conical-cylindric, obtuse. 



17 b. Capside sessile. 



Diphyscium. Stem very short, with numerous short radicles. 

 Leaves ligulate, thick costate. Perichretal leaves larger, ovate- 

 lanceolate thin, deeply serrate or lacerate-ciliate at the apex, 

 costa excurrent into an awn. Capsule ventricose, ovate-conical. 

 Outer peristome more or less rudimentary, usually with 16 

 notches representing teeth ; inner peristome membranaceous 

 and forming a truncate cone of 16 or 32 twisted folds. Lid 

 conical, acute. 



16 b. Inner peristome made up of numerous separate 

 segments. 



18 a. Capsule spherical or nearly so, without a 



collum or with an indistinct one. 



