2»2 



HANDBOOK OF BRITISH HEPATIC.^. 



broken up by deep pits communicating with 

 the air-cavities. Larger and lighter coloured 

 than R. glaiica. 



Riccia oystalliiia, Linn. Sp 1605 ; Cooke 

 Hep. fig. 200 ; Lindenb. Mon. 437, t. xxii., 

 fig. 2. 



On banks and hedges on damp mould. 



var. a vulgaris. Fronds less deeply cut, 

 lobes obcordate, margin rather elevated, 

 crenate. 



Riccia pellucida, Hoffm. Germ. 96. — [Plate 7, 



fg- 94)- 



var. /3 palustris. Fronds with linear lacinise, 

 apex less dilated, crenulately emarginate. 



Riccia crystallina j3, Hook. Muse. Brit. 212 ; 

 Eng. Fl. v., I, p. 98; Lind. Mon. t. xxii., 

 fig. 2. No. 9. Lichen palustris, Dill. Muse. 355, 

 t. 78, f. \2.— [Plate J, fig. ci^b.) 



Grows in more shady and moist situations than 



R. glaJica, has the fi'ond* 

 generally longer,broader, and 

 much thinner, nearly plane, 

 with the segments more 

 numerous, and very obtuse, 

 colour by no means glau- 

 cous, rather perhaps inclin- 

 ing to yellowish green. 

 Fronds in orbicular tufts radiating from the centre, 

 when fresh of a remarkably crystalline appearance. 



196. 



