KEY TO THE GENERA. XXXV 



/Leaves very narrow, subulate-setaceous 12. Swarlzia 



\ Leaves wider, with a sheathing lamina at base 28. Fissidens 



B. Leaves with hyaline points, op with the nerve 



exeurrent in a hair. 



/Leaves with longitudinal lamellae on inner face of nerve 2 



\ Leaves without lamelke on inner face 3 



/ Leaves long, stiff, opaque, with numerous lamellse 6. Folytrichum 



\ Leaves short, soft, with only 4 lamellae 10 



/Leaves nerveless, or shortly two-nerved at base 33. Hedwigia 



•'XLeaves single-nerved half-way or more 4 



/Nerve one-third or more of width of leaf near base 24. Campy /opus 



**"(_ Nerve not one-third of base 5 



/Lamina hyaline at apex, nerve (apparently) vanishing 6 



'\Lamina not hyaline above, nerve exeurrent in a hair 9 



,/Basal cells of leaf very long and narrow, nodulose 30. Rhacomitrium 



\ Basal cells not nodulose, at most sinuose only 7 



/Peristome double, capsule immersed, striate 30. Orthotrichum 



* \ Peristome single or none, capsule exserted, or immersed and smooth 8 



o/Calyptra plicate ; Is. with thickened plicse on each side of nerve ...31. Coscinodon 

 \Calyptra smooth ; Is. without thickened plicse 2g. Grimmia 



{Cells rhomboid, with pointed ends 77. Btytim 

 Cells more or less quadrate 10 



{Peristome absent, or of short straight teeth 38. * Pottia 

 Peristome long, twisted 3Q. Tortula 



C. Leaves with longitudinal lamellse on inner face ; 



peristome teeth connected by an epiphragrn. 



/Leaves with a thickened, toothed border, lamellse few 4. Catharinea 



\ Leaves not bordered 2 



/ Lamellse sinuose 3. Oligotrichum 



\ Lamellse straight, very numerous 6. Polytrichum 



D. Leaves bordered. 



/ Leaves 2-nerved 83. Hookeria 



\ Leaves 1 -nerved 2 



/Cells (except the border) short, dense, sub-quadrate 3 



\Cells elongate, or large and roundish-hexagonal 4 



/ Border of elongate cells, more or less translucid 39. Tortula 



3\Border-cells scarcely elongate, opaque 43. Cinclidotus 



f Cells lax, truncate-hexagonal ; capsule erect ; seta smooth 61. Funaria 



H\ Cells hexagonal-rhomboid or roundish ; capsule inclined or cernuous (except 



[ Daltonia) 5 



/Border strongly toothed ; Is. large 78. Mnium 



->\Border entire, or more or less toothed near apex only 6 



, /Leaves large, roundish-ovate ; cells not much elongate 7 



\Leaves more or less tapering above ; cells elongate 8 



f Leaves obtuse or bluntly apiculate ; peristome teeth free 78. Mnium 



7-! Leaves shortly and suddenly acuminate ; inner peristome a dome-shaped 

 \ membrane 79. Cinclidium 



o/Nerve reaching apex or exeurrent 77. Bryum 



\Nerve ceasing some distance below apex 9 



/Leaves widely ovate or obovate ; acrocarpous IS- Webera 



"\Leaves narrow-lanceolate ; pleurocarpous ; seta rough 84. Daltonia 



* For the Key to the Species oi Pottia, see Addenda. 



