494 HEP A TICJi. 



ill Britain \^ Riccia fumida Lindenb. which is veiy distinct from it, 

 bein2^ a much smaller plant, very neat and regular in its shape, 

 and possessing- a double rowof cilia; both species grow at Barmouth, 

 and there is no difficulty in distinguishing them with the naked eye. 



Riccia Lesciirlana Aust., a North American species, approaches 

 the nearest to it, but is thinner, not so purple in colour, with the 

 margins more incurved and with more numerous cilia, which are 

 often 2 and 3 rows deep ; it is also monoicous according to Prof. 

 Howe. 



Riccia Bi.^cJioJfii Huben., a Continental species, is nearly allied 

 to it, but in this the fronds are broader and shorter, generally 

 bilobed, obovate or obcordate, channelled above, but thick and 

 prominent beneath, surrounded with a broad membranaceous 

 margin, fringed with large obtuse cilia. 



Herr Stephani in his ">S/y. Hep. " p. 14, refers Riccia (jJauccsceiis 

 to Riccia hifiirca Hoffm., a non-ciliate species. 



Lindberg refers it to Riccia Michclii Raddi ; to the ciliate form 

 of which Dr. Levier refers this species. 



The description and some of the observations are taken from 

 Carr. & Pears. Hep. Brit. Exsicc. n. 6G, contributed by Dr. 

 Carrington. 



Description or Plate CCXXII. — Fig. 1. Plants natural size. 

 2. Frond x 11 (Barmouth, W. H. P.). 3. Cross-section of 

 Irond X 24 (ditto). 4-8. Ditto x 24 (Barmouth, Dr. Carring- 

 ton). 9,10. Ditto X 16 (Aberffraw, W.Wilson). 11,12. Cilia 

 X 25 (Barmouth, Dr. Carrington). 13. Style x 85 (ditto). 



8. Riccia ciliata, Hoffm. 



Riccia ciliaia, Hoftmann, Deutschl. Fl. p. D.J (179G). 



Monoicous,'ca?spitulose, small, pale or yellowish-green in colour, 

 concolorous. Fronds sub-orbicular or llabellate, somewhat thin, 

 dichotomously or sub-stellately divided ; lobes linear or slightly 

 cuneate, obtuse or sub-emarginate, towards the apex sub-canali- 

 culate, margin slightly thickened and fringed with numerous long, 



