10 SYNOPSIS OF BRITISH MOSSES. 



branched, fastigiate. L. lanceolatej flexuose when 

 dry, opaque, upper cells minutely quadrate-hexagonal, 

 laxer at base, more or less papillose above, nerve 

 strong. Caps, ovate-oblong, elongate, striate, deeply 

 sulcate when dry, slightly cernuous. Perist. t. solid, 

 16, deeply bifid, papillose, with the basal membrane 

 extending above mouth of caps, behind the teeth. 



Fam. 4 Distichiacese. 



L. distichous, compressed, subulate, from a sheath- 

 ing base, smooth, cells minutely quadrate above, lax 

 hexagono-rectangular below. Antheridia long, sub- 

 cylindric, archegonia, long-styled. Caps, erect or 

 cernuous. Perist. t. irregular, narrow, plane. 



29. Distichium, B. and S. Densely caespitose, silky. 

 St. 1. exactly distichous, spreading subulate, from a 

 semi-amplexicaul base, nerve broad. Caps, erect or 

 cernuous, coriaceous, shining, lid conical. Perist. t. 

 linear-lanceolate, sub-entire, or variously bifid and 

 lacerate, punctured, hygroscopic. Spores small. 

 Monoicous. 



Tribe x. Pottiace*. 



Perennial, rarely annual, densely gregarious or 

 csespitose. Cell formation of 1. parenchymatose, hexa- 

 gono-quadrate, and rotundate, above more or less 

 papillose or smooth, densely chlorophyllose, at base 

 laxer, dilatate-rectangular or hexagono-rectangular, 

 hyaline or chlorophyllose. PL gemmaceous. Calyptra 

 cucullate, rarely mitriform or lobed, smooth. Caps, 

 generally erect, symmetric, or slightly curved, varying 

 from subglobose to cylindrical. Perist. rarely absent, 

 simple, lineal-lanceolate, entire or bifid, with filiform 

 crura. 



