ORTHOTRICHUM. 247 



C. AFFINIA. Leaves with recurved margins ; not hair- 

 pointed. Peristome teeth reflexed or revolute when dry. Stomata 

 superficial. O. Shawii, O. leiocarpum, O. Lyellii, O. speciosum, 

 O. affine. 



D. TENELLA. Leaves with recurved margins ; not hair- 

 pointed. Peristome teeth reflexed or revolute when dry. Stomata 

 immersed. O. rivulare, O. Sprucei, O. Schimperi, O. stramineum, 

 O. tenellum, O. pattens, O. pulchellum. 



E. DIAPHANA. Leaves with recurved margins ; with a 

 hyaline hair-point. Peristome teeth reflexed when dry. Stomata 

 immersed. O. diaphanum. 



F. OBTUSIFOLIA. Leaves with erect or incurved margins ; 

 not hair-pointed. Stomata superficial. O. obtusifolium. 



{Ls. very broad at the top ; apex rounded or minutely apiculate 2 

 Ls. narrowed to the top, usually more or less acute or subacute 4 



{Ls. ovate, coarsely papillose, with erect margin 77. obtusifolium 

 Ls. faintly papillose, margin revolute in lower half. 3 



/Ls. oblong-lingulate, usually obtuse, cells about 10 //. g. rivulare 



^\Ls. obovate, upper ones apiculate, cells about 20 /* 10. Sprucei 



/Ls. long, with brown clavate gemmae on surface, very papillose 6. Lyellii 



4\Ls. without appendages 5 



{Ls. tapering to serrulate hyaline points 16. diaphanum 

 Ls. without hyaline points 6 



, /Capsule smooth, without bands or striae j. leiocarpum 



\ Capsule striated 7 



/Stomata on capsule superficial 8 



' \Stomata immersed below the cuticular cells 11 



„/Perist. teeth erect, or spreading when dry ; growing on rocks and walls /. rupestre 



\Perist. teeth reflexed or revolute when dry ; usually on trees 9 



/Peristome single ; capsule faintly striate below mouth only 4. Shawii 



9\ Peristome double; capsule distinctly striate 10 



/Capsule emergent, striate in upper half 7. speciosum 



I0 \ Capsule immersed, strongly striate in whole length 8. affine 



/ Capsule exserted 12 



I: \Capsule immersed or emergent only 15 



/Peristome double, teeth reflexed when dry ; ls. crisped 75. pulchellum 



I2 \Peristome usually single, teeth erect when dry ; ls. not crisped 13 



/Capsule narrow, 8-striate ; perist. teeth usually 8 [var. of] 2. anomalum 



I3 \Capsule wider, 16-striate ; perist. teeth 16 14 



{Calyptra hairy ; striae on capsule red-brown 2. anomalum 

 Calyptra naked ; striae orange [var. of] 3. cupulatum 



/Capsule 16-striate : peristome single .3. cupulatum 



J 5\Capsule 8-striate ; peristome double 16 



,/Vaginula very hairy 12. stramineum 



1 \Vaginula naked 17 



/Capsule short, sharply contracted to the pedicel 11. Schimperi 



J 7\Capsule elongate, gradually tapering to the pedicel 18 



„/ Capsule subcylindric ; calyptra conic, with few hairs 13. tenellum 



\ Capsule oval-oblong ; calyptra campanulate, naked 14. fallens 



