12 A MANUAL OF MOSSES 



9. Capsule apiculate; leaves entire, papil- 

 lose .- Phascuvi, p. 100 



9. Capsule not at all or very slightly apicu- 

 late; leaves erose-denticulate at the apex, 



smooth Acaulon, p.129 



10. Protonema persistent; plants prac- 

 tically stemless; leaves ecostate; 

 calyptra splitting down one side and 

 usually remaining attached to the 



seta Discelitim, p. 126 



10. Protonema not persistent; calyptra 

 not as above. (With a large inflated 

 hypophysis. Splachnum, p. 125) .... 11 

 11. Peristome teeth none, or if present ar- 

 ticulate 12 



11. Peristome teeth not distinctly articu- 

 late 60 



12. Peristome present, sometimes im- 

 perfect 13 



12. Peristome none 52 



13. Leaves distichous, dorsally winged and 



clasping at the base 127 



13. Leaves not distichously clasping and 



dorsally winged 14 



14. Leaves consisting of costa only, 

 outer cells large and empty, inner 



small and chlorophyllose Leucobryum, p. 7S 



14. Leaves with a lamina consisting 

 mainly of one layer of more or less 



uniform cells IS 



15. Peristome single, 16 or 32 toothed; teeth 

 without a median longitudinal line on the 



exterior face 16 



15. Peristome double, with 16 outer teeth and 



an inner variously segmented or almost 



lacking membrane; teeth with a median 



longitudinal line on the exterior face. 37 



16. Capsule more or less octagonal, the 



angles with differentiated cells, 



when dry 8-striate and furrowed.. . Rhabdoweisia, p. 6 



16. Capsule not octagonal, or, if plicate, 



the cells uniform 17 



17. Exterior face of teeth longitudinally 



striate 18 



17. Exterior face of teeth smooth or papil- 

 lose, not longitudinally striate 24 



18. Leaves with large hyaline or 



brownish alar cells 22 



18. Leaves without differentiated alar 



cells 19 



19. Leaf-cells strongly and coarsely papil- 

 lose Oreoweisia, p. 50 



19. Leaf-cells smooth 20 



20. Peristome of 16 broad solid teeth, 

 sometimes somewhat bifid at the 

 apex, smooth and strongly hygro- 

 scopic Seligeria, p. 58 



20. Peristome of 16 narrow, prolonged, 

 more or less two-parted, minutely 

 striate or papillose teeth 21 



