CESIA. 407 



stems, arcuately brancliecl, dark brown or almost black in colour, 

 in shaded situations greenish ; in this species the segments are 

 acute, with the hyaline fringe of leaf composed of narrow sharp- 

 pointed, irregularly projecting cells. 



Cesia coral lloidcH (Nees) has a more acute leaf, without sinus, 

 or if present, very shallow, or very irregular through being 

 weathered, and always has a very delicate diaphanous hyaline 

 border, so delicate that rarely any cellular structure is to be 

 observed. This character, along with the entire absence of any 

 approach to crenulation of the segments, at once separates it from 

 C. ohtuHa. 



Cesia ofjfiisa (Lindb.) was first recognised as British by 

 Mr. George Stabler and published in " Journal of Botany " for 

 1880. 



Description of Pj.ate CLXXIX. — Fig. 1. Plants nat. size. 

 2. Portion of stem x 64 (Cader Idris, E. M. Holmes). 

 3-7. Leaves x 81 (Glen Finnan, Dr. Carrington). 8, 9. Ditto x 

 31 (Scotland, Croall). 10. Lobes of leaf x 85 (Norway, Lind- 

 berg). 11. Portion of leaf x 290 (Grlen Finnan, Dr. Carring- 

 ton). 12, 13. Bracts x 31 (ditto). 14, 15. Portions of the 

 innermost bracts x 04 (Mardale, G. Stabler). 10. Bracteole x 

 G4 (ditto). 



9. Cesia crenulata [Gollsc/ic). 



Gymnomit7'iiim crenulatuvi, (\ottsche in dxvrington'a Iii!-li TTepatica^, Trans. Bot. 



Soc. Edinb. vii. (18r.:5). 

 Acolea crenulata, J)um. Hep, Eur. p. 125(1874). 



Dioicous, densely coespitose, tufts very depressed, small, of a 

 dark reddish or greenish brown or almost black colour. Stems 

 with about 20 cortical cells, reddish colour, 10 cells in diam. ; 

 intricately entangled, creeping, prostrate or suberect, arcuaiely 

 branched, filiform, wiry, catenulate, terete, or somewhat com- 

 pressed then lanceolate in outline ; radiculose, rootlets few. 

 ]jeaves closely imbricate, erect, scarcely broader tlnm the stem, 

 oval, ovate or broadly ovate, bidentate to about \, sometimes 



