10 BKITISH HEPATIC^. 



pentine, flexuose, attaclied to the ground, here and there, by fascicles 

 of rootlets. 



Leaves distichous, scarcely broader than the stem, amplexicaul, 

 vertically imbricated, ovate, sub-complicate, acutely notched, the 

 lobes short, connivent ; apex rounded, and resembling the prow of 

 a small boat ; margin narrow, scariose ; cells prominent, crenulate. 



Texture, thin but firm, scarcely altered when dry. Colov/r dark 

 olive-brown, sub-lsevigate. Cells minute (f. 3), the two or three 

 marginal rows hyaline; outer row conoid in form (f. 4), g-fg" long 

 by TT5o" broad ; cells of upper third hexagonal, g^" by tAt" 5 

 basal cells oval-oblong, 7^" by x:^ "• The marginal cells are most 

 prominent near the apex; those of the inferior border are more 

 tabular, and obscurely crenate. Endochrome brown, distinct. 



Dioicous. Involucral leaves 3 to 4 pairs, double the size of the 

 stem-leaves and less concave, upper pair remarkably convolute, so 

 closely embracing each other, that without care they may be mis- 

 taken for a colesule. Inner involucre of two smaller leaves, bi- or 

 tri-lobed, the lobes dentate ; areolation pellucid, rhomboid, 



Calyptra obovate, delicatelyreticulate, surmounted by the narrow 

 style ; barren pistillidia oblong, pale, striated, 8 to 12 in number. 



Capsule spherical, buff-coloured ; valves ovate, of firm texture, 

 punctate, striate. Spores round, irregular in outline, reddish-brown, 

 2/33" to 1 7^5 " ^ diameter. Blaters bi-spiral, length from -g^o" to 

 Xtt'j ^'iid from 3^-g^" to 4-7V0" broad in the centre. 



Ferigonial leaves on separate shoots, shorter and more gibbous 

 at the base than the ordinary leaves. Antheridia axillary, generally 

 solitary, round, seated on a short footstalk. 



Pl. I. Fig. 3.^1. Shoots iimnagmfied. 2. Barren and fertile shoots, x 16 dimn. 

 3. Leaf from the stem, lateral view. 4. Fragment of margin more highly magnified, to 

 show the ' crenulate cells.' 5. Inner involucral leaf, enclosing young fruit. 6. Spores 

 crnd elaters. 7. Ferigonial leaf 



III. Nardia, Qr. 8f B. 



Jungermannia, Ehrh, Beitr. p. 80 (1788). 



Nan-dius, Gray & Bennett, Nat. Arr. Br. PI. II. p. 694 (1821). 



Marswpella, Dum. Com. Bot. p. 114, p.p. (1823) ; Recu. d'Obs. Jung. p. 24 (1835). 



San-coscyphus, Corda, in Opiz. Beitr. i. p. 652, n. 5 (1829). 



Ma/rmpia, Dum. Syll. Jung. Ent. p. 77, n. xvii. (1831). 



Mesophylla, Dum. Com. Bot. p. 112 (1823) ; Syll. Jung. Eur. p. 80, n. xix. (1831) ; 

 Eecu. d'Obs. Jung. p. 24 (1838). Alicularia, Corda, in Opiz. Beitr. i. p. 652. n 2 

 (1829)j Dum. SyU. p. 79, n. xviii. (1831). r , 



Souifibya, Spruce, Muse. Pyr. Trans. Bot. Soc. Ed. y. iii. p. 197 (1850). 



Dioicous. Colesule connate with the involucral leaves, and 

 connective tissue of the receptacle, to form an urceolate involucre • 

 stoloniferous at the base. Shoots ascending or erect, simple or 

 furcate ; innovations from the ventral aspect. Leaves distichous 



