9 



Ls. not setaceous 10 



xliv KEY TO THE GENERA. 



/ Leaves squarrose, plicate 7 1 - Breutelia 



^ \ Leaves not squarrose 5 



/ Leaves papillose 6 



■* \ Leaves smooth 8 



,/Leaves small, closely imbricated in 5 ranks 68. Conostomum 



\ Leaves larger, not conspicuously 5-ranked 7 



/ Ls. ovate or ovate-lanceolate ; branches often whorled 70. Philonotis 



'\Ls. long, lanceolate or linear ; branches not whorled 69. Bartramia 



o /Ls. almost setaceous, very narrow 



\ Ls. not setaceous 



/ Ls. sharply serrulate near apex ; nerve wide below 74. Leptobryuvi 



"\Ls. bluntly toothed; nerve narrow ; cells wider 73. Orthodontium 



{Ls. usually lanceolate ; nerve not reaching apex* 11 

 Ls. usually ovate ; nerve often reaching apex 77. Bryum 



/Tufts very dense and compact ; ls. very small 72. Oreas 



\ Tufts usually looser ; ls. larger 7_f. Webera 



{Leaves toothed in the whole upper part 13 

 Leaves entire, or toothed near apex only 22 



{Leaves plicate 32. Ptychomitrium 

 Leaves not plicate 14 



{Leaves squarrose, more or less recurved 15 

 Leaves not squarrose 19 



/ Ls. sub-acute or somewhat obtuse, strongly papillose 19. Dichodontium 



5\Ls. acute, smooth or finely papillose 16 



,/Ls. short, ovate or oblong 17 



\ Ls. lanceolate or linear 18 



/Stem tall, tomentose ; ls. widely ovate 64. Palttdella 



7 \Stem short; ls. oblong 41. Leptodonthim 



o/Cells small, rounded 48. Zygodon 



\ Cells more or less quadrate or oblong (>g. Bartramia 



{Leaves sharply papillose 6 

 Leaves smooth or obscurely papillose 20 



/ Ls. long (3 lines), coarsely toothed, incurved when dry 66. Timmia 



\Ls. shorter, crisped and twisted when dry 21 



/ Ls. linear or ligulate, with rather blunt points jy. Rhabdoweisia 



2I \Ls. - 



linear-lanceolate, tapering to narrow points 18. Cyrwdontium 



/Cells rounded, or irregular and pellucid 23 



\ Cells more or less regularly quadrate . . .26 



/Leaves short, scarcely f line long 4 g. Zygodon 



•'(Leaves longer, usually over 1 line long 2 . 



/Ls. dark-green, rigid and imbricate when dry , 50 . Orthotrichum 



*\Ls. usually paler, more or less crisped when dry 25 



/Ls. with narrow points ; base dilated, unistratose 40. Ulota 



5 \Ls. with rather wide points ; base not dilated, bistratose 6y. Aulac'omnium 



( Plants in deep, dense tufts among rocks ; Is. usually linear or linear-lanceolate. ..27 

 26-j Plants short, or loosely tufted ; ls. usually lanceolate, with the margin recurved, 



[ at least in part ,q 



/Tufts very compact, bright green above; ls. rather short 47. Ancectangium 



' \ Leaves long and narrow ; tufts less compact 2 8 



„/Ls. acute; cells minute, rather opaque 2 Q 



\Ls. sub-acute, or acute with pellucid cells ^\ Weisia 



{Ls. curled up or merely flexuose when dry ; nerve not glossy at the back when 

 r d 7 -C^"7 ■••■■■;■■:•■■■:-•••■••■ 4&. Zygodon 

 Ls. Long, much crisped and twisted when dry ; nerve usually glossy at the back 

 43- Trichostomum 



* See also under Webera, p. 302. 



