BRITISH HEPATICtE. 29 



tinct, divided into three parts, each 3-5V0" iii diameter, the whole 

 equal to rrto"- 



Amphigastria rare, except at the apex of young shoots 

 _(f. 31, 6), long and slender, subulate, erect, resembling the leaves 

 in texture. 



Inflorescence dioicous. Eructiferous shoots unknown. 



AndrcBcium spicate, terminal. Perigonial leaves (f. 31, 8) more 

 rounded and convex, gibbous at the base, the posterior lobe sub- 

 quadrate, inflexed. 



Antheridia 2 or 3 in each leaf, round or obovate, shortly stipi- 

 tate. Sometimes, from the growth of innovations, the male spikes 

 are interrupted, or seated below the summit. They are narrower, 

 and less compressed than the ordinary shoots. 



The cell-structure alone will suffice to distinguish this species from Nardia coni- 

 pressa, the trigones being remarkably large in the former, -whilst in the latter the walls 

 of the cells, are thinner and more translucent, and contain the peculiar roundish cor- 

 puscles I have described under N. scalaris. In R. comp>~essa the leaves ai'e nearly- 

 plane, so that, but for the interposed stem, the whole surface would come in contact with 

 the opposite leaves ; they project equally on each side of the stem; their texture is more 

 tender, shrinking when dry ; the colour a pale translucent green, often tinged crimson 

 or purple, and not polished. 



In the absence of fructification, I was led, from the resemblance between N. Gwr- 

 ringtonii, and the antarctic Adelanihtos occlusus (H. f. & T.) Mitt., to refer it to the 

 same genus. But the discovery of terminal perigonial leaves proves that it cannot 

 belong to Adelanthus ; and until fertile plants are met with, I think it better to 

 associate it with N, compressa. 



Pl. X. 'Fig. 31, Na/rdia Carringtonii. — 1. Shoots natural size. 2. Stenv-leaves 

 xl6 dia^n. 3, 4, 5. Leaves x 16. 6. Amphi.gastria. 7. Leaf-cells x 250. 8. Peri- 

 go'nial leaf, enclosing antheridia. 



8. Nakdia compressa, Grr. 8f J3. 



Pl. III. Pig. 9. 



Shoots stoloniferous, erect, innovant from the ventral aspect, 

 laterally compressed ; leaves projecting equally on each side the 

 stem, roundish or reniform, decurrent, plane, vertically appressed ; 

 involucre obovate-oblong, hidden by the involucral leaves ; amphi- 

 gastria triangular-subulate ; capsule oval. 



Jimg. compressa, Hook.Brit. Jung. t. Iviii. ; Muse. Brit. 2 ed. p. 229 ; Lindenb. 

 Jung Eur p 33, n. 22 ; Eng. Bot. t. 2587 ; Flor. Brit. i. p. 109, n. 13 ; Fl. Hibern. ii. 

 p 50 n 18 ; Fl. Danica, t. 1774, f. 2 ; N. ab E. Leberm. Eur. i. p. 289, ii. p. 453. 



Na/rdius, Gray & Ben. Nat. Arr. Br. Pl. 1. p. 694, n. 2 (1821). 



Mesophylla, Dum. Comm. Bot. p. 112 (1822); Syll. p. 80, n. 117, t. 2, f. 19; 

 Kecueil d'Obs. Jung. p. 24. 



Alicularia, Synop. Hepat. p. 12, n. 4; Hartm. Scand. Fl. ix. ed. ii. p. 129 ; Gott. 

 & Raben. Hep. Eur. Ex. n. 443, c. icon. 472, et 537. 



Lichenasirwm alpinum purpv/reum, Dill. Muse. t. Ixix. (ex parte) f. 1, F. G. 



