SYNOPSIS OP BRITISH MOSSES. 9 



somewliat hygroscopic. Calyptra large; or small 

 [Stylostegium). 



Tribe vs.. LEPTOTEiCHACEa:. 

 PI. varying in size. L. subulate, from a lanceolate 

 base, smooth, shining, upper cells narrowly rectangular 

 or minutely quadrate, basal laxer, hexagono-rectangular. 

 Caps, erect, symmetric, oval, or cylindric. Perist. t. 

 long, bifid, with filiform crura, papillose, erect or 

 slightly oblique. 



Fam. 1. Bruchiaceae. 

 Annual or perennial, simple or branched. L. 

 lanceolate-subulate, uppermost in a comal tuft, nerved, 

 shining. Calyptra small, cucullate. Caps, ovate, more 

 or less acuminate. Spores small. 



26. Pleuridium, Brid. L. from an oblong base, 

 lanceolate and lanceolate-subulate, apex remotely and 

 obtusely serrate. Caps, ovate-globose or ovate, shortly 

 apiculate, smooth, shining. 



Fam. 2. Ditriehaceae. 



27. Ditriclinin, Timm. PI. small, csespitose, or tall 

 and slender. L. lanceolate-subulate, smooth, glossy, 

 cells narrowly rectangular, basal lax and hexagono- 

 rectangular. Caps, oval or cylindric, generally erect 

 on a slender seta. Perist. t. 16, longish, cleft quite to 

 base, filiform, articulate, papillose. Spores very small, 

 smooth. 



Fam. 3. CeratodontsB. 

 L. linear-lanceolate or subulate, obsoletely or dis- 

 tinctly papillose or smooth. Perist. t. long, densely 

 articulate at base, divided almost to base. 



28. Ceratodon, Brid, Many times dichotomously 



