KEY TO THE GENERA. xlv ' 



/Nerve reaching the more or less toothed apex z6. Ceratodon 



^ \Apex entire, or else the nerve vanishing below it 4.0. Barbula 



Y. Pleupocarpous mosses with nerved leaves and short 



cells. 



{Stem covered with green paraphyllia, markedly pinnate 100. Thuidium 

 Stem without paraphyllia 2 



{Ls. serrate above ; plant tall, dendroid, rigid 92. Porotrichum 

 Ls. entire, or toothed near apex only 3 



,/Ls. more or less toothed near apex 4 



3\Ls. entire throughout 5 



{Ls. smooth, cells more or less rhomboid 706. Lescurcea 

 Ls. papillose, cells oval op. Pseudoleskea 



/Nerve ceasing about ^ or | up the leaf 6 



->\Nerve reaching nearly or quite to apex 8 



,/Ls. ovate, over \ line long 81. Crypkaa 



\L&. minute; plant very slender 7 



{Ls. imbricate, papillose, cells very small 99. Pseudoleskea 

 Ls. sub-complanate, smooth, cells larger go. Myrinia 



o/Primary stem stoloniform, with minute leaves 95. Anomodon 



\ Stem not stoloniform 94. Lesiea 



Z. Pleurocarpous mosses with nerved leaves and long 



cells. 



{Ls. strongly papillose at back 2 

 Ls. smooth, or with a few papilk-e near apex only 3 



/Stem markedly pinnate, with paraphyllia 100. Thuidium 



2 \Stem irregularly branched, slender 97. Pterigynandrum 



/Ls. with sharp, recurved teeth at apex, margin revolute 91. Antitrichia 



3\Ls. without recurved teeth at apex 4 



/Stem dendroid, bare below, branched above 5 



4 \Stem not strikingly dendroid 7 



/Ls. rather obtuse, serrate, plicate 101. Climacium 



5\Ls. not plicate, more or less acute, serrulate only 6 



, / Ls. short-pointed ; plant rather robust 107. Isothecium 



\Ls. acuminate; plant small 112. Eurhynchium 



/Cells rarely more than 2-5 times as long as wide 8 



' \ Cells long and narrow 9 



,,/Leaves entire or nearly so, or with a very thick nerve 114. Amblystegium 



\Leaves serrulate, at least near apex 112. Eurhynchium 



( Leaves either transversely rugose, or on a red stem, clothed with paraphyllia 

 oJ 116. Hylocomium 



[Plant without either of these characters 10 



/Leaves uniformly falcato-secund irj. Hypnum 



I0 \ Leaves not falcato-secund n 



/ Ls. plicate, with long, narrow acumen, more or less imbricate 12 



I: \Ls. not plicate, or plicate with shorter points 14 



/Ls. lanceolate, tapering almost from base 13 



1 2 \ Ls. wider at base, ovate-lanceolate no. Brachythecium 



f Stem creeping, on walls or trees, etc., branches incurved 108. Pleuropus 



1 3 \ Stem erect, usually on the ground tog. Camptothecium 



