104 HEPATiCiE. [Marchaniia. 



entire length, with the usual fibrous radicles ; among these radicles, and 

 almost concealed by them, arise, on each side of the midrib, a few mem- 

 branaceous oblique scales, which are more evident upon the young 

 shoots or innovations, where the roots are fewer and are there of a purple 

 hue : occasionally, scales of a similar nature, but greenish colour, 

 overlap the margin of the innovations at the extremity. These scales, 

 when seen in their more perfect state, appear to be unequally 2-lobed 

 at their anterior margins. Fructification, as far as 1 have observed, 

 constantly dioecious. Male receptacle entirely sessile, arising, apparently, 

 always from the midrib in various parts of its surface: in form and 

 structure resembling the two preceding species. Female receptacle pe- 

 dunculated: peduncle differing from that of other Marchanlice in being 

 remarkably succulent, as in Jungermannia epiphylla, becoming flat and 

 apparently membranaceous when dry, and having, so far as we can ob- 

 serve, but one groove with one bundle of fibres ; this peduncle is inserted 

 in a concave disk, and is 2—4 inches long. The receptacle is conical, 

 inclining to ovate, obtuse at the summit, the margins deflexed and cut 

 into about six very short emarginate lobes; involucres green, 2-valved; 

 calyx quadrifid, and each seeming to contain but one ovate capsule, 

 which is partially exserted and cut into several revolute segments. 

 Seeds large, dark, olivaceous ; spiral filaments double.— The bruised/roncte 

 are singularly fragrant, resembling Bergamot. 



4. M. hemisph&rica, Linn, (hemispherical Marchantid); recep- 

 tacle of the capsules hemispherical cut at the margin into 4 — 10 

 equal lobes, that of the anthers pedunculated with a thin mar- 

 gin, frond with large cells and pores. Linn. Sp. PL p. 1604. 

 E. Bot. t. 503 and*. 2545? (under M. commutata, Lindenb. Syn. 

 Hepat. jo. 101. M. androgyna, excl. the 2 lower Jigs.) Muse. 



Brit. ed. 2. p. 222 M. androgyna, Linn.? — M. quadrata, Scop. 



Cam. ed. 2. p. 63 Bebouillia hemisphcErica, Baddi, in Opuse. 



Scient. di Bologna. —Dill. Muse. t. Ih.f. 2. 



Sides of mountain-streams and moist banks, not uncommon. Fr. 

 Apr.— Fronds procumbent, imbricated, oblong, 1—3 inches long, rarely- 

 simple, generally forked, waved and crenate at the margin; texture be- 

 tween carnose and membranaceous, inclining to the latter; colour dark 

 green above, frequently with a dark central line indicating the midrib, 

 underside often purple at the margin, midrib prominent, throwing out 

 numerous silky fibres, and on each side beset with purple scales, par- 

 tially concealed by the roots, sometimes the centre of the frond below 

 is purple; on the upper surface the cells are very distinctly marked, and, 

 as in M. polymorpha, furnished in the centre with a pore. Fructifica- 

 tion monoecious, as well as dioecious ; male receptacle with short pedi- 

 cels springing from the midrib in a sinus at the extremity of the frond ; 

 receptacle peltate, flat and papillose above, purplish, the margins some- 

 what reflected, cut into 4, 8 or 9 rounded lobes. Anthers as in M. po- 

 lymorpha. Female receptacle with pedicels 2—4 inches long, hemisphae- 

 rical, cut at the margin into 4—10 or 11 obtuse, deflexed lobes, 

 covering as many membranaceous involucres, which are entire at the 

 margins ; calyces white, membranaceous, quadrifid, 2 — 3 in each invo- 

 lucre. Calyptra as in the preceding. Capsule scarcely protruded at 

 maturity, consequently on a very short fruit-stalk, dark brown, cut nearly- 

 half-way down into 7, 8 obtuse revolute segments, containing a great num- 



