36 KEY TO THE GENERA AND SPECIES OF BRITISH MOSSES. 
33 { Peristome — = ridimentadys 34 
Peristome pre 49 
34 {5 aps. ae eee bos Bart dul. 
ie erect or suberect (or ininored) 85 
35 =e s. striate, regularly furrowed w 36 
Caps. smooth (or BIVeWaUy rate ae schon dry) 37 
s. long, linear-lanc., not squarrose; seta v. short ...... re 
widely lanc., it ane Bata LON GOR ois ne ieverccsreanses Zygodon 
vite exserte (or subimmersed in Hymenost. rostellatum) .......++ 39 
Pl. v. small; lid matte oh PAPIULOGE : s6scsncensrauaseoeuessuuies Systegium 
Si Lid a des duo mooth, fet Blindia cespiticia 
Cal. Ast = lindo, covering capsule ; ls. large, opaque, —_ v. large 
39 we nealy jpta 
af als is: smooth ‘or with smaller papille 40 
40 e, oblong, or eoanee cells usu. lax 4] 
tie ie ahs. or rai Bn cells clos 45 
41 roundish, v sede seta thick Cdivodium 
Ut: not rounded, acute or with excurrent nerve 
42 u. excurrent; cells short; lid bea oad OF CONG scnasa snore nes Pottia 
{No ce . ceasing below apex; cells long; lid conic or convex ...2...:..00006 43 
3 { Ls. pipe a pardered s lid nearly flat Entosth. ericetorum 
4 {ts not bor 44 
44 tid alm. ne cells in spiral lines ..........ce000 Funaria Jascioniae ris 
Lid usu. conic, w. cells in straight lines .................. Physcomitrium 
45 Pl. minute, on stone; Is. subulate, smooth ......... pads Doniana 
Ls. lane. or linear, usu. papillose; pl. usu. larger 46 
a6{ 8: ex shed Rea partly steal’ at mouth ............ Hymenostomum 
(N. not ex caps. open at mout 47 
47 = Lid sae atl annulus gira ls. r. obtuse......... Gyroweissia 
~ ros — ; annulus absent 48 
minal; Is. linear- cased eed biceinseancweniers +++-.Gymnostomum 
booee on a <a branch; Is, r. hon lanceolate ......... ; fa tum 
ote 
49 { Peristome of 4 simple undivided teeth 50 
Peristome of more than 4 te 51 
50! Pl. alm. stemless; with al Nerveloss: 1s... lc, Tetrodontium 
501 Stem leafy ; Teron es stems bearing gemmiferous cups......... Tetraphis 
+ 
51 { Capsule ee 52 
CODON OXPGTEON entra secee, se erispevenceavnricccestessessssbesies boees ceiseces cs, 56 
Pl. alm. MiSs perich. ls. ciliated; caps. oblique ...... Diphyseiw 
° Reichl Is. not. ciliated; caps. reg gular nigel 
Fruit t DIB ove ccs onc seesseres oobasvovvensseessesuniswsedkiensanesvusigesace D4 
53{ fruit on a on a aoe Ipherel DYANO)e ove icsesacsecpuvsesivdswsiveisvccaaasundin 55 
54 { Capsule not striate; peristome single Grimmia 
54) Capsule striate, or smooth with double peristome ...... Orthotrichum 
554 LS: with thickened border; peristome Sci st. long......Cinclidotus 
Leaves not bordered; peristome double Cryphea 
56 Stem evidently pinnate or iplauate 175 
Stem not evidently pinnate 57 
