Rice I A. ' 493 



7. Riccia glaucescens, Carrhifjlon. 



Riccia glaucencens, Carr. in Carr. it Pears. Hep. Brit. Exsicc. fase. 1, n. GO (187><). 

 liiccia Michelii, Raddi, Lindb. Muse. Scand. p. 2 (187!>). 

 Riccia bifarca, Hoflm. Steph. 8p. Hep. p. 'M) (1 ",)()()). 



Dioicous, cicspitose, small, pale glaucous green antically, 

 border somewhat paler, postical surface covered laterally by a 

 delicate membrane or detached scales of a purple colour, best seen 

 when the plant is dry and the border incurved, mid-line brownish. 

 Fronds flabellate-furcate, sometimes crowded and imbricating each 

 other ; segments linear-cuneate or battledore-shaped, concave, not 

 canaliculate on the upper aspect, surrounded by a rather broad 

 border, recurved and convex when moist, but inflexed when dry ; 

 texture homogeneous, composed of large cells arranged in regular 

 series, thickened along the mid-line of the lower surface, margins 

 thinner, acute, fringed with small but strong translucent cilia, 

 sometimes these are wanting or irregularly disposed, and the 

 border simply crenulate ; radiculose, rootlets hyaline. Capsules 

 few, occupying the hollow central channel near the base of the 

 frond ; spores large, brown, muriculate, angular-convex, about 

 10 areolae across the convex side. 



Dimensions. — Fronds G" mm. to 12- mm. long, segments 

 1- mm to 3- mm. broad, -3 mm. to 7 mm. thick; cilia -l mm. x 

 '05 mm. ; capsule "75 mm. ; spores "1 mm. 



Hab. — On damp banks or mud-covered rocks in exposed 

 situations, usually near the coast. Eare. 



1. Penzance, Cornwall, //^. (7^/r//o?r. 7. Barmouth, Merioneth- 

 shire, i)>-. Carrhfffon, W. H. P.\ AberfFraw, Anglese}', TF. Wihon; 

 Aber, Carnarvonshire, W. Wihon. 12. Leveus Park, Westmor- 

 land, G. Stabler. 13. Portpatrick, /. McA/idrcw. 15. ^lontrose 

 Links, A. Cruo.l/ ; Den of Fullarton, Forfar, ^1. Croall. 



Obs. — A large and characteristic species discovered by my late 

 friend Dr. Carrington at Barmouth, where it grows in some 

 abundance, remarkable for its glaucous antical surface, hence its 

 name. 



The only other bicolourous ciliate species which has been found 



