SYNOPSIS OF BEITISH MOSSES. 31 



secundj or complanate. Calyptra cucullate, pilose, or 

 smooth. Caps, shortly exserted or on a long seta, 

 erect, regular. Perist. single or double. 



Fam. 1. Leptodontse. 



L. complanate, broad, thinly nerved, cells minutely 

 rhomboid. Vaginula distinct. Calyptra hairy. Perist. 

 single, of 16 pale, slender teeth. 



92. Leptodon, Mohr. Secondary stems short, de- 

 pressed, simple or bipinnate. L. obtuse, bisulcate, 

 opaque, smooth or slightly papillose, ovate-oblong or 

 subrotund, scarcely nerved to apex. Caps, oval-oblong, 

 lid with a straight beak. Perist. t. 16, slender, equi- 

 distant, minutely papillose, whitish. Annulus absent. 

 Dioicous. 



Fam. 2. Leucodontae. 



Secondary stems irregularly or subpinnatedly 

 branched. L. patent, secund, lanceolate, sometimes 

 sulcate. Per. 1. much sheathing. Calyptra large, 

 smooth, or scarcely hairy. Caps, on a longer or shorter 

 seta, erect, regular. Perist. single or double, more or 

 less perfect. 



93. Pterogonium, 8w. Primary stem a creeping 

 rhizome, secondary erect. Br. fasciculate or dendroid. 

 L. spreading, imbricate when dry, smooth, broadly 

 obovate, acuminate, serrulate, nerve bifid, cells narrow, 

 obliquely oval at base, except in middle base, apical, 

 shortly fusiform. Caps, regular or subarcuate. Calyptra 

 very slightly hairy. Perist. t. large, densely articulate. 



94. Leucodon, 8chw. Secondary st. erect or arcuate, 

 stolouiferous. L. decurrent, broadly ovate-lanceolate, 

 deeply sulcate, nerveless, cells at apex and mid-leaf 



