HANDBOOK OF BRITISH HEPATIC^E. 285 



Riccia tumida, Linden. Mon. 459, t. xxvii., 

 fig. 2 ; Carr. and Pears. Exs. No. 67. 



Frond two to three lines long. (Plate 7, fig. 



9 2.} 



This may be recognised amongst British species, 

 with a purplish under surface, by the ciliated 

 margin, in which respect it differs from R. nigrella, 

 as well as in its thicker substance. 



Rieeia nigrella, De Cand. 



Frond dichotomous; laciniae linear, chan- 

 nelled; margin membranaceous, quite entire, 

 dark purple beneath ; transversely scaly, scales 

 semi-circular, not exceeding the margin. 



Riccia nigrella, De Cand, Fl. Fr. V., p. 193; 

 Lind. Mon. p. 467, t. xxix., fig. i ; Carr. and 

 Pears. Exs. 65, 290. Riccia lamellosa, Ralfs. 

 Cooke Hep. No. 133. 



On damp banks. 



Small in all its parts, with linear dichotomous 

 lobes, margin membranous, entire, expanded, and 

 dark green when moist, but when dry remarkably 

 inflexed, and displaying the dark purple scales 

 which clothe the lower surface, and which are 

 rounded and closely imbricate. (Plate 6, fig. <?/.) 



SUB GENUS i. RICCIOCARPUS, Corda. 

 Fruit immersed in the frond, and protu- 



