SYNOPSIS OP BRITISH MOSSES. 13 



basal membrane, cleft to base into two equal filiform 

 crura, often fragmentary, sometimes slighty oblique 

 but not twisted, erect when dry. Annulus rarely 

 absent. Spores as above. 



37. Barbula, Hedw. Perennial. Habit, growth, 

 and leaves similar to last. Perist. of 16 teeth, divided 

 into 32 long filiform crura, spirally twisted and con- 

 torted, inserted into a tesselated membranous tube at 

 base. 



Tribe xi. CALYMPEEACEiE. 



Perennial, dichotomous, with innovations below 

 floral apex, densely radiculose. L. Ungulate, apical 

 cells minute, rotundate, chlorophyllose, densely pa- 

 pillose, basal lax, smooth. Caps, erect, oblong, or 

 cylindrical, lid with a long styliform beak. Perist. 

 simple or double, rarely absent. Calyptra very large. 



38. Encalypta, Schreb. Csespitose. L. linear, lingu- 

 late, or spathulate, upper cells hexagonal, hyaline 

 mixed with chlorophyllose, lower hexagono-rectangular. 

 Caps, erect, oblong, or cylindric, regular. Calyptra 

 large, smooth, extinguisher-shaped, completely cover- 

 ing the capsule, with a long upright beak. Lid with a 

 similar beak. 



Tribe xii. GeimmiaceJ!. 

 Generally acrocarpous, very rarely cladocarpous, 

 with innovations below the floral apex. L. opaque, 

 lower cells hexagonal or linear, and sometimes sinuous^ 

 upper hexagono-rotundate or punctiform, densely 

 chlorophyllose. Fl. gemmiform. Caps, erect, gene- 

 rally symmetric, on an upright or arcuate seta. 

 Calyptra mitriform, large, rarely cucullate, smooth, or 

 sulcate, frequently pilose. Perist. seldom deficient. 



