284 HANDBOOK OF BRITISH HEPATICyE. 



Riccia soroearpa, Bisck. 



Segments of the frond linear, subdichoro- 

 mous, carinate-sulcate, green on both surfaces ; 

 lobes thick and fleshy, oblong, obtuse, or 

 emarginate ; margin thin, glabrous, inflexed 

 when dry ; fruit scattered along the mid-vein. 



Riccia soroearpa, Bisch. Hep. Nov. Act. N. 

 Cur. XVII., p. 1053, t. 71, f. 11 ; Got:, and 

 Rabh. Exs. 23, 543 ; Carr. in Grevillea, II., 

 p. 88 ; Carr. and Pears. Exs. No. 139 ; Braith. 

 Grevillea, I., p. 144. 



On limestone rocks and moist walls. 



Fronds forming shallow strata, crowded and 

 entangled, so as to be separated with difficulty ; 

 colour pale glaucous green. Segments one to three 

 lines long, one-quarter to one-third line broad. Pis- 

 tillidia scattered along the carinate base of the lobes, 

 young fruit immersed, at length elevating the epi- 

 dermis, which it ruptures to allow the escape of the 

 spores. 



Spores smaller than in R. bifurca, dark brown, 

 crenate-reticulate. — {Plate 6, Jig. 80.) 



Riccia tumida, Undent. 



Frond nearly simple, oblong-linear, obtuse, 

 thickened about the apex beneath, and at the 

 margin, above channelled, below purplish ; the 

 margin singly, the apex doubly ciliatc. 



