MoOKE — On the Mosses of Ireland. 
341 
Tribe 15. Skitophtlle^. 
Mosses growing more or less gregariously, with ascending or erect 
stems, sometimes prostrate in marshy places. Leaves distichous, 
equitant at the base, or conduplicate, the upper part vertically 
prolonged into a scalpelliform leaf, with or without cartilaginous 
thickened borders ; areolation dense, cellules roundish or hexa- 
gonal. Fruit terminal or lateral ; capsules on long or short pedi- 
cels, often cernuous, variously shaped, sometimes short and 
truncate. Peristome single, of 16 teeth, cloven half-way down, 
rarely solid or joined in 8. Calyptra small, cucullate or dimi- 
diate. 
One genus, . . . . . .71. Fissidens. 
Tribe 16. Poltteicheje. 
Mosses with stems of a peculiar rigid habit, simple, or branching from 
a creeping underground rhizome, growing gregariously, often in 
very large masses together. Leaves spreading regularly, mostly 
5-8 ranked ; nerve broad, and lamellated ; areolation dense. Cap- 
sule smooth or angular. Peristome of 1 6-64 teeth, adherent by 
their points to the top of the columella. Calyptra dimidiate, 
smooth or hairy. Male flowers discoid. 
Genera. 
Leaves thickened at margin ; calyptra smooth, 
slighly spinulose at apex, . . .72. Catharinea. 
Leaves not thickened at margin, . . .73. OLiaoxEicHUM. 
Calyptra hairy; capsule smooth, or indistinctly 
plicate, . . . . , .74. Pogonatum. 
Capsule strongly angular, . . . .75. Polytrichum. 
Tribe 17. BuxBAUMiEiE. 
Mosses stemless, or with very short stems, growing singly or gre- 
gariously on the ground or on decayed wood. Leaves few, short 
and broad, nerved or nerveless ; areolation lax or dense. Capsules 
large oblique, gibbous underneath. Peristome double, outer of 
short rudimentary teeth ; inner a conical membrane, plicated into 
16 plicse. Calyptra small conico-mitriform. 
Genera. 
Capsule perlicellate, . . . . .76. Buxbaumia. 
Capsule sessile, 77. Diphyscium. 
