HANDBOOK OF BRITISH HEPATIC^. 283 



Riccia gflaueeseens, Carr. 



Frond flabellate-furcate, segments linear, 

 wedge-shaped, concave, with rather a broad 

 border, margins thinner, fringed with small 

 translucent cells, not channelled above, pale 

 glaucous, apex emarginate ; under surface 

 purplish. 



Riccia glaucescens, Carr. in Carr. and Pears. 

 Exs. No. 66. 



On moist ground. 



Dioicous. Fronds flabellate-furcate, sometimes 

 crowded and imbricate, segments linear, cuneate, 

 or battledore-shaped, concave, not channelled on 

 the upper side, surrounded by a rather broad bor- 

 der, recurved and convex when moist, inflexed 

 when dry, texture homogeneous, composed of large 

 cells, arranged in regular series, thickened along 

 the mid line of the lower surface; margins thinner, 

 acute, fringed with small but strong translucent 

 cells, sometimes wanting or irregularly disposed, 

 and the border simply crenulate. Apex of the 

 fronds emarginate, lobes connivent, connected at 

 the base by a lunate fold, between which there 

 is often a small central tongue proceeding from 

 the inferior lobe of the frond. Colour pale trans- 

 lucent, glaucous green above, border somewhat 

 paler, under surface covered laterally by a delicate 

 membrane, or detached scales of a purple colour. 

 Capsules few, occupying the hollow central channel 

 near the base of the frond. Spores large, dark 

 brown, muriculate. (Plate J,fig. #7.) 



