1(36 KANSAS ACADEMY OF SCIENCE. 



J J t t Teeth thirty-two. 

 Teeth cancellate, filiform or linear; pedicel long, twisted to the left, * Barbula, 115 



I I Teeth not articulate. 



J Teeth thirty-two or sixty-four. 



Calyptra cucullate; capeule symmetric or nearly * Atrichum, 255 



Calyptra mitrate, densely hairy; capsule 4 6 angled, teeth 64, * Polytrichum, 263 



* * Peristome double. 



t Capsule symmetric, erect. 

 Teeth broadly or narrowly triangular-lanceolate; capsule rib- 

 bed, not twisted. 

 Leaf-cells at base hexagono-rectangular, hyaline * Orthotrichum, 164 



■f "I" Capsule unsymmetric, inclined, oblique, or pendulous. 



X Inner peristome a membrane, carinate or cut into sixteen segments; 

 these sometimes separated by cilia. 



II Cilia very short, rudimentary or none. 

 Membrane latticed or cleft to the base into filiform appendicu- 

 late segments. 



Pedicel none or very short, leaves ecostate * Fontinalis, 268 



Membrane not cleft to the base. 



Segments entire or interruptedly cleft along the middle line. 



Shorter than the teeth or rudimentary * Funaria, 200 



Equaling the teeth in length; leaves not squarrose. 

 Leaf-cells narrowly rhombic-hexagonal, tending to linear, 



leaves narrower * Webera, 215 



Leaf -cells and leaf broader * Bryum, 223 



Segments bifid, divisions divaricate. 



Leaves lanceolate to subulate, large * Bartramia, 203 



Leaves lanceolate or broader, plants smaller x Philonotis, 208 



Segments filiform, united by fours at their tips * Timmia, 254 



II II Cilia present. 

 Appendiculate. 



Leaves lance-subulate, cells linear * Leptobryum, 215 



Leaves broader, cells rhombic-hexagonal * Bryum, 223 



Inappendiculate; capsule not ribbed when dr'^. 

 Leaves lanceolate, glossy, cells narrowly rhombic-hexagonal, in- 

 clining to linear * Webera, 215 



Leaves large, soft, oblong-ovate or broader, cells round-hexagonal, * Mnium, 241 



B. Pleurocarpi. Flowers and fruit lateral, in the axils of leaves. 

 [ Foutinalis may be found here. ] 



1. Peristome single (rarely none); teeth eight or sixteen. 



Leaves distichous, with broad vertical wing * Fissidens, 81 



Leaves serrate to ciliate-dentate ; capsule long pediceled x Fabronia, 294 



2. Peristome double, the inner often imperfect. 



* Segments none or short, or obscured by adhering to the teeth. 

 t Leaves papillose. 



