14 SYNOPSIS OF BEITISH MOSSES. 



simple or doublej both teeth and cilia planej rarely 

 filiform. 



Fam. 1. Grimmiae. 



Perist. single, of 16 teeth, transversely articulate, 

 lanceolate, entire, or perforate, or divided to base in 

 two filiform crura. Calyptra small, often rough or 

 hairy. 



39. Grimmia, Hhr. Pulvinate, rarely c^spitose, 

 branches dichotomous, fastigiate. Calyptra sometimes 

 small many-lobed, or large sub-mitriform, cloft at 

 base, or lobed and simply cucuUate. Perist. t. lanceo- 

 late, entire, and perforate, or bi- or trifid, papillose, 

 very rarely short and truncate. 



40. Racomitrium, Brid. PI. generally taller, broadly 

 cssspitose, L. elongate-lanceolate, muticous, or hair- 

 pointed, concave, margin recurved, cells at apex 

 narrow, minutely quadrate, or linear-sinuous, lower 

 cells elongate-sinuous, narrow. Caps, oblong, cylin- 

 dric, on an upright rarely curved seta, lid small, beak 

 subulate. Calyptra conico-mitriform, lobed, often 

 darker coloured and rough at apex. Perist. t. with a 

 narrow basal membrane, more or less deeply cleft into 

 two subequal filiform crura. 



Fam. 2. Ptychomitriae. 

 Calyptra large, mitriform, plicato-sulcate, naked. 

 Perist. t. 16, lanceolate, entire, or perforate, or linear, 

 divided into two filiform crura. 



41. Glyphomitrium, Sahw. PI. small, pulvinate, 

 scarcely branched. L. solid, ovate- and elongate- 

 lanceolate, curved when dry, apical cells roundish, 

 minute, basal rectangular. Caps, erect, subglobose, 

 lid acutely conical. Annulus absent. Calyptra cleft 



