88 



NEW BIUTISH HEPATIC^. 



Nardia revoluta. (N. ab. E.) Lindb. 



Leaves erecto-patent, bidentate, rigid, sub-complicate, round or 

 elliptic-obovate, base narrowed, clasjnng ; sinus and lobes acute, 

 margins re volute throughout. (Fr. ?) 



Sarcoscyphus revolutus, N. ab. E. Eur. Leberm. ii., p. 419., iv., p. 

 xxxiv., Syn. Hepat., p. 8. 



Jung, atrata, Mitten, HejDat. of East Indies. (Jour. Lin. Soc, 

 1859, p. 90.) 



Sent to Prof. Lindberg, Aug., 1 873, by Mr. David Orr, of Glasnevin , 

 under the name of Andrcea alpina. Luggielaw, Co. Wicklow, 1851. 



Fronds densely csespitose, of an intense black colour, sub-kevi- 

 gate, stoloniferous at the base. 



Stolons matted together, of nearly the same thickness as the 

 stems, dark-brown, brittle, sparingly radiculose. 



Shoots ascending, simple, half an inch to an inch long, rigid. 

 Innovatious from the apex or axils of the upper leaves, fasciculate. 



Leaves bifariously imbricated, complicate-concave (f. 22 — 

 23), bi-dentate, erect and adpressed when dry, erecto-patent 

 when moist ; roundish or elliptic-obovate (f. 21, 25), from a some- 

 what narrowed base. Near the base of the stem they are smaller 

 and more distant, gradually enlarging upwards, except when inno- 

 vations are present, when the stem is interrupted, and the upper 

 leaves scarcely exceed it in diameter (f. 25). 



Lobes equal, acute, cuspidate ; sinus deep, equal to about i of 

 the length of the leaf, angular, but a little rounded at the base from 

 the recurvation of the margin. Margin narrowly but uniformly 

 reflexed, so as to appear thickened under the lens (f. 22). 



Texture of the leaves dense, polished, scarcely altered when dry, 

 colour pitch-black, deep-brown by reflected light. Cells minute, 

 thick-walled polygonal (f.24),those of the margin sub-quadrate, com- 

 pressed, -ptVq" broad. Cells of the middle of the leaf hexagonal, 

 ttW m length, by T ^j -" broad ; basal cells more elongated (-775-0") 

 but not differing in breadth. Trigones small. 



This interesting addition to our list of Hepaticte was collected 

 by Mr. David Orr, as long ago as 1851, but overlooked as a form 

 of Andrsea, which it resembles in habit and colour. Himalayan 

 specimens, from Dr. Hooker, differ only in the shoots being sub- 

 falcate, and the leaves more secund. 



In size, and the emargination of the leaves, N. revoluta is inter- 

 mediate between N. emarginata and N. Funckii, but the narrow 

 revolute continuous border will at once distinguish it from 

 these, and all allied species. The leaves of N. emarginata are 

 usually reflexed at the base, but the lobes are blunter, and plane at 

 the margin. (PI. 18, fig. 19-25 



PI. 18, f. 19, Nardia revoluta, natural size. 20, shoots X 16 

 diam. 21, 23, 25, stem leaves X 30. 22, lateral aspect of upper 

 leaf (involucral ?) 24, portion of the leaf to shew the reticulation 

 and revolute border X 120 diam. 



