28 



BRYACEJE. 



lower. Operculum rostrate, 

 cucullate. 



Peristome simple or none. Calyptra 



* Peristome none. 



Plants small. Capsule erect ; operculum 

 strongly adherent. 



Plants larger. Operculum long-beaked, de- 

 ciduous. 



Plants large, dicliotomously divided, as in 

 Pleurocar2:>L 



10. Astomum. 



11. Gymnostomum. 



12. Anoectaiigium.. 



* * Peristome simple, of 16 teeth, iri-egularly splitting or perforated 



Plants small. Capsule long-pedicellate. 

 Teeth tj'ansversely articulate, entire or 

 perforated. 



Plants large. Periclia3tium sheathing. Teeth 

 more distinctly articulate, entire or bitid at 

 apex. 



Leaves soft, coarsely papillose, serrulate above. 

 Capsule sliglitly curved. 



Leaves minutely papillose on both faces. Cap- 

 sule striate, erect. 



Leaves minutely crenulate. Capsule short, 

 ovate, with a distinct collum regular or 

 strumose. Teeth irregularly split. 



Leaves enlarged, sheathing at base, irregularly 

 serrulate. Teeth 2-3-cleft to the middle. 



13. Weisia. 



14. Dicranoweisia. 



15. Oreoweisia. 



16. Rhabdoweisia. 



n. Cynodontium. 

 18. Dichodontium. 



* * * Teeth regularly bifid to the middle (Dicranoid). Leaves smooth; 

 basilar areolation quadrate, enlarged at the angles. 



Leaves lanceolate-subulate. Capsule arcuate 

 with a long narrow collum. 



19. Trematodon. 



20. Angstroemia. 



21. Dicranella. 



Stems nearly simple, filiform. Capsule small, 

 erect, subglobose. 



Plants small. Capsule cernuous. Segments 

 of the teeth filiform, granulose. 



Plants large. Leaves spreading or secund, not 

 or scarcely sheathing; costa strong, more or 

 less dilated toward the base. 



Leaves long, setaceous-subulate, the upper 

 part filled by the broad costa ; basilar areo- 

 lation nuicli enlarged, brown at the angles. 



Capsule on a curved flexuous pedicel. Calyp- 

 tra cucullate, ciliate at base. 



Plants frondose. Leaves distichous, conduplicate in the lower part, alate 

 on the back, expanded above into a simply costate lamina. Peri- 

 stome of Dicraiium. {Subtribe Fissidente^. ) 



Frond-like; not aquatic. 25. Pissidens. 



Plants slender, branching and floating. Leaves 

 distant. 26. Conomitrium. 



Plants soft, spongy, whitish yellow. Leaves thick, composed of three 

 superposed layers of cells, with intercellular simple narrow ducts. 

 ( Subtribe Leucobrye^. ) 



Peristome of Dicranum. 27. Leucobryum. 



22. Dicranum. 



23. Dicranodontium. 



24. Campylopus. 



