390 HEPATIC^. 



Hab. — Discovered on moist shelving rocks, near the last 

 spring below the summit of Ben Nevis, July 1875, by the late 

 Mr. John Whitehead. This is the only known British station. 



Found on the Continent. 



Obs. — With only imperfect sterile British specimens collected, 

 this species has been a puzzle to our leading authorities, but since 

 good fertile ones have been met with on the Continent the 

 difficulty has been solved, and it turns out to be a true Marsupella. 

 No doubt the specimens collected by Mr. Whitehead were growing 

 in a very moist situation, and had differentiated in a remarkable 

 manner from the perfect state. A distinct species, and not likely 

 to be confused with any other when met with. 



Dp:script]on of Plate CLXXI. — Fig. 1. Plants natural size 

 (Ben Nevis, John Whitehead). 2. Portion of fertile stem x 24 

 (Norway, S. 0. Lindberg). 3. Portion of $ stem x 31 (ditto). 

 4. Sterile stem x 31 (Ben Nevis, J. Whitehead). 5-8. Leaves 

 X 64 (ditto). 9-12. Ditto x 24 (Norway, S. O. Lindberg). 

 13. Portion of stem with leaves x 120 (Ben Nevis, J. White- 

 head). 14. Portion of leaf x 290 (Norway, S. 0. Lindberg). 

 15. Bract x 24 (ditto). IG. Portion of involucre, showing 

 portion of bract and perianth x 31 (ditto). 17-19. Perigonial 

 bracts x 31 (ditto). 20. Antheridium x 85 (ditto). 



Genus 34. CESIA, Gr. & B. 



Jungermania, Lightf. Fl. Scot. 2, p. 786 (1777). 

 Cesius, Gr. & Benn. Nat. Arr. Brit. PI. i., p. 705 (1821). 

 Gijmnomitrium, Corda in Opiz Beitr. 1, p. 651 (1829). 

 Acolea, Dum. Syll. Jung. Eur. p. 76 (1881). 

 Cesia, Lindb. Muse. Scand. p. 9 (1879). 



Stems fasciculate, ascending or erect, creeping at the base, 

 flagella radiculose ; glaucous green, reddish brown, or almost 

 black. Leaves succubous, distichous, closely imbricated, emar- 

 ginate-bidentate. Stipules wanting. Perianth wanting. Involucre 

 double, inner shorter, composed of two or more involute deeply 

 cleft and dentate free bracts, which enclose the short campanulate 



