Musci. 355 



-»--(-+- I'eiistoine-tcetli dividiiij^ to tlin base, tko usuiilly liliform diviHions inoslly c(|ual, wholly 



distinct or more or less coherent in pairs. Capsule ohlong or cylindrical, lon<,'-pedicellate. 



++ Peristome without basilar membrane : leaves dull and papillose. 



10. Ceratodon. Leaves lanceolate : capsule subcernuous, striate becoming,' .sulcate. Teeth 



cleft nearly to the base, the eipial distinct divisions pronunently jointed. 



11. Didymodon. Leaves linear or linear-lanceolate. Capsule erect. Teeth short and fuga- 



ceons, entire or cleft to the base into lilifonn divisions. 



++ ++ Peristome upon a more or less produced basal membrane : capsule erect. 

 = Leaves smooth and shining. 



12. Leptotrichum. Leaves lanceolate-siibulate, not crisped when dry. Teeth ecpially or nn- 



erpially cleft to the base, the divisions distinct or coherent. Basal membrane narrow. 

 — = Leaves dull and ])apillose. 



13. Trichostomum. Leaves linear or lanceolate, mostly acuminate. Teeth often imperfect, 



eiiuaily divided, the filiform divisions rarely wliolly distinct, erect or slightly twisted. 



14. Desmatodon. Leaves soft, broader ovate- or obovate-oblong, obtuse or obtusish. Teeth as 



in tiie last, rather short and subulate, incurved when dry. 



15. Barbula. Leaves various. Filiform divisions distinct, mostly very long and twisted. 



* * Leaves opposite, distichous. 

 10. Fissidens. Leaves infolded at base, e<pntant (a dorsal wing produced into a vertical bltvde). 

 Ca|isulo oval or oblong, ccrnuous. Teeth as in Dicramim, hliform-lanceolate, horizon- 

 tally inllexed when dry. 



17. Distichium. Leaves subulate-setaceous, spreading, shining. Capsule oblong or cylindrical, 



erect or nodding. Teeth subentire or bilid. 

 Tr.ir.R HI. OlMMMIE/E. Caulescent perennials, with dull leaves in several ranks, the areo- 

 lation minutely rouml-hexagonal or punctate above, and hexagonal or linear and often 

 sinuous at base. Flowers bud-like. Calyptra mostly mitriform, smooth or sulcate and 

 often hairy. Capsule erect or sometimes nodding, pedicellate, usually regular. Peristome 

 single or (louble, or sometimes none ; teeth 4, 8 or 16, entire or more or less bifid, usually 

 flattened ; cilia alternate with them when present. 

 * Peristome none. 

 +- Leaves nerveless, hyaline at the apex : capsule not striate nor apophysate. 



18. Hedwigia. Capsule globose, immersed. Calyptra mitriform, covering only the convex or 



umbonate operculum. 



19. Braunia. Capsule long-pedicellate, turbinate. Calyptra cucuUate, covering the capsule. 



Operculum conic, obtuse. 

 -I- +- Leaves costate, not hyaline at the npex : capsule 8-striate, with obconic collum. 



20. Zygodon. Ca])snle scarcely exserted, ovnte, becoming urceolate. Calyptra cucullate. cov- 



ering the obliipiely short-beaked operculum. 



♦ ♦ False peristome of four rigid triipietrous entire teeth. 



21. Tetraphis. Capsule cylin<lric, long-pndicclled. Calyptra mitriform, naked, irregularly sul- 



cate. Leaves ovate-lanceolate, costate. 



* * * Peristome single, ]uirple or orange, of 16 distinct teeth, entire or more or less deeply cleft, 



often perforated : capsule rarely striate or sulcate. 

 -I- Calyptra not plicate nor hairy. 



22. Grimmia. Low, growing in circtdar more or less comjiact tufts. Leaves often setosely 



tii)j>e(l. Calyptra lohcd-mitriforin or cucullate, smooth. Operculum obtuse or shortly 

 beaked. Capsule erect or nodding, innnersed or shortly exserted. 



23. Rhacomitrium. Taller, cespitose. Leaves often denticulate-acuminate. Calyptra lobed- 



mitiiform, rough-beaked. Operculum narrow, mostly aciculate-beaked. Capsule erect, 

 usually long-pedicellate. 



-i — t- Calyptra lobed-mitriforni, plicate. 



24. Ptychomitrium. Rather tall, tufted. Leaves linear-lanceolate, denticulate above. Cap- 



sule erect, long-pedicellate, with aciculate operculum. 



* * * * Peristome doulde or single, or rarely none (in Encahjpta), usually jiale, of 16 entire 

 teeth, not perforated, often in pairs : capsule mostly striate and at length sulcate, erect : 

 calyptra large, mitriform or campanulate, often hairy. 



25. Orthotrichum. Calyptra campanulate, plicate. Capsule immersed or exserted, apojdiysate. 



Operculum short-conic. Teeth mostly in jiairs, usually reflexed when dry, with often 

 8 or 16 inner cilia. 



26. Encalypta. Calyptra long-cylindric, rostrate, not idicate. Capsule long-pcdiccUed, with- 



out collum. Operculum long-beaked. Peristome single or none. 



