SrNOPSIS OF BRITISH MOSSES. 15 



on one sidej and lacerate or incised at base. Perist. t. 

 lanceolate, approaching in pairs, entire^ reflexed when 

 dry. Spores large, smooth.. 



42. Ptychomitrium, B. and 8. PI. somewhat larger, 

 fasciculato-CiBspitose. L. long, crisped, nerved, apical 

 cells quadrate or rounded, basal linear-elliptical or 

 hexagonal, opaque. Caps, erect, symmetric, on a 

 longer seta. Calyptra naked or scaly, deeply lobed, 

 beak aciculate. Annulus broad. Perist. t. long, linear- 

 lanceolate, cleft to base into two subulate or filiform 

 crura, erect when dry, papillose. Spores small, smooth, 

 or punctulate. 



Fam. 3. Zygodontae. 

 More or less pulvinate, radiculose, dichotomously 

 branched. L. patent or squarrose, linear-oblong or 

 lanceolate-cuneiform, apical cells minutely quadrate, 

 densely chlorophyllose, papillose, basal lax, hexagono- 

 rectangular, hyaline, nerved. Caps, immersed or ex- 

 serted, oval-oblong, striate, with a long neck, lid with 

 an oblique beak. Perist. absent, single or double, of 

 8 broad lanceolate teeth, bifid, alternate with filiform 

 ciHa when double. Calyptra cucullate, smooth. 



43. Amphoridium, Schp. Pulvinate, yellow or brown- 

 green above, blackish below. L. soft, carinate, crisped 

 when dry. Calyptra small, fugacious. Qaps. without 

 teeth, on a short seta, urceolate when dry, deeply 

 furrowed. 



44. Zygodon, Hook and Tayl. L. squarrose or 

 patent, incurved imbricate when dry, linear- oblong 

 or lanceolate-spathulate, nerve vanishing in apex or 

 shortly excurrent. Caps, oval-oblong, on a long seta, 

 with a tumid neck, less distinctly striate. Perist 

 absent, single or double. 



