HANDBOOK OF BRITISH HEPATIC7E. 287 



Sub-Genus 2. RICCIELLA, Braun. 



Fruit globose, exserted, adnate to the 

 lower surface of the frond. — Braun. Bot. Zcit. 

 1821, p. 756. 



Ricciella fluitans, Br. 



Frond dichotomous, J? to 2 inches in length, 

 yellowish green, repeatedly forked, laciniae 

 linear, narrow, obtusely emarginate, and forked 

 at the apex, sometimes thickened, usually 

 membranaceous, channelled, margin and be- 

 neath of the same colour. 



Riccia fluitans, Linn. Sp. 1606 ; Eng. Bot. 

 t. 251 ; Lindenb. Mon. t. xxix., xxv. ; 

 Hook. Muse. Britt. 213; Eng. Fl. V., i., p. 

 98; Cooke Hep. f. 198. Ricciella fluitans, 

 Braun. Flora, 182 1, p. 754; Lindenb. Syn. 

 p. 115; Carr. and Pears. Exs. 140. Lichcn- 

 astrum aquaticiun, Dill. Muse. 514, t. 74, 

 f. 47. 



Floating on stagnant water. 



var. /3 canaliculata, narrower, margin ele- 

 vated, sulcate. 



The fronds float on stagnant water, amongst 

 duckweed, or occasionally root in the 

 soil at the margin, when they are of ( ^,^ ^r/LjV 



a smaller size ; of a yellowish-green ^^ 



colour, from 1 to 2 inches in length, ^""^S^s^L- 

 the segments linear, but a little en- 

 larged towards the apex, which is 



