KEY TO THE GENERA AND SPECIES OF BRITISH MOSSES. 199 
4g {Angular cells large, thin, hyaline; dioicous........... sssessess0Chraceum 
cells small, m. or |. obs cure or coloured ; monoicous wihiks 47 
47 hdualic cells obscure; n. often single; annulus absent........ palustre 
Ang. salle distinct, orange; n. faint, double; annul. wide...eugyriwm 
LESKEA, 
1 te ovate-lanceolate, acute, n. ceasing below apex ..... vsseee Dolycarpa 
Ls. from ovate base, errs acumin., n. strong to apex......nervosa 
MNIUM. 
1 | argin entire 2 
Leaves with toothed margin 4 
2 AN on cells piece long and aa in 1 or more rec Sie Coosgevie 3 
cells r. elongate, marginal sc. distin nelidioides 
3 { Margin of 2—4 layers; Is. usu. apicul.; Clie Oval Wo a wnctatum 
8 | Margin of 1 layer; ls. obtuse; caps. roundish .............+. glo X08 
4 / Margin not bordered, serrate ure 
\Ls. with thickened border 5 
Border simply serrate (the teeth single, in one rank) 6 
Border doubly dehtats (the teeth in a double err 9 
g{ St. 1—8 in.; Is. serr. to base; lid conic; dioicou 7 
St. }-—1 in.; 1s. serr. in upper half only; syAsieoue 8 
7 {78 a ob e, undul.; cells angular-rotund.............+. undulatum 
Ls. ovate, acute; cells ly Bess 
8 Ess acute, ovate or oblong; lid co: cuspidat 
Ls. obtuse, apiculate, obovate; id 2 Piiae rostratum 
of te lanc., slightly decurrent on stem; lid mamillate ............hornum 
Ls. wider, w. long decurrent wings; lid Conic, TostTate ......c.000.e0 10 
10 Pl. robust; 1s. 2—3 lines long; nerve CXCUITENE ....s40e00004--SPINOSUM 
‘St. $1 in.; Is. 1} line or less; n. ceasing in apex 11 
ll Cells rounded at the corners, about 25 / in diameter 
Cells hexagonal, smaller, about 12—15 #; dioicous. ‘uniariiaien 
12 a 8; ls. obovate Nia serration often weak ............ serratum 
Dioicous ; Is. broadly elliptic riparium 
MYURELLA. 
1 /Ls. closely imbric., obtuse or v. shortly apiculate julacea 
1) Ls. sp reading, more distant, usu. w. longish apiculus......... apiculata 
NECKERA. 
1{ Ls. nos + undoleted (cf. Homalia "agate abt seveesedeune complanata 
Ls. m. or ]. undulated transver 2 
g {Ca sail immersed; Is. se. undula ss ven MOAB. sy ersaei seereeeers -PENnata 
Caps. exserted; Is. aadulais wet or 3 
3! (Pl. small; 1s. under 1 line long, usu. m. or 1. acuminate......... pumila 
(Pl. robust; Is, 1—2 lines long, r. obtusely pointed...............006 crispa 
ORTHOTHECIUM. 
1 / Pl. v. small; 1s. subsecund, se. striated intricatum 
lip. Sasceies Is. ‘hou strongly plicate rufescens 
ORTHOTRICHUM, 
1 / Ls. obtuse or minutely ap 2 
\Ls. more or less acute or subacute 4 
9 { Ls. oie v. papillose, with erect m: octsetiscdelbees ae 
Ls. faintly papillose, —— revo alate 1 sa loss half. 
3 Ls. oblong-lingulate, usu. obtuse, cells about 8 # seeseeeeeseeen PVUlaTE 
Ls. obovate, upper ones ps Cells about 16 [...ccccseseeeee 
