CRYPTOGAMIA HEPATIC^. 65 



is very short, and seems to arise out of little branches 

 which bud from the main stalk. 



22. J. byssacea, stems very slender, filiform, depressed ; leaves 

 2-rowed, very small, alternate, erecto-patent, the apex divided into 

 two equal segments ; fruit terminal. (Tab. v. Fig. 20.) HOOK. 

 Scot. ii. 113. 



Hob. Elevated heaths in exposed situations, in brown 

 patches. Dirrington Law, Berwickshire. 



Our specimens have smaller leaves than those preserved in 

 MOUGEOT and NESTLER'S useful collection; and they lie 

 so close to the stem, that only a few of them can be seen 

 to be bifid. It approaches very near to J. oicuspidata. 



J- Frond broad. 



23. J. epiphylla, fronds procumbent, imbricate, obsoletely ribbed, 

 smooth above, tomentose beneath, the margin waved and often 

 sinuated ; fruit arising from the superior part of the frond near 

 the apex; calyptra exserted LIGHTF. Scot. 788; WITH. iii. 

 1061 ; HOOK. Scot. ii. 118; DILL. Muse. t. 74. f. 41. 



Hob. On wet dripping rocks, and moist shady banks by the 

 sides of rivulets, common, and generally intermixed with 

 Marchantia polymorpha. Spring. 



" This plant has the habit of a MarcTiantia, but of a more 

 tender substance, pellucid, and tesselated. The leaves are 

 about half an inch broad, and lie flat upon the ground, are 

 smooth, and of a light green colour on the upper side, di- 

 vided in the middle by a black line or nerve ; which, on the 

 under side, emits numerous downy radicles, by which the 

 plant adheres closely to the ground. Each leaf is divided 

 into two or three obtuse or round segments, a little sinua- 

 ted and crisped on the edges. From the centre of the 

 leaves, out of a red (purple) calyx, arises a short, cylindrU 

 cal sheath, with a quadrifid rim, out of which grows a pel- 

 lucid, tubular, silvery, tender peduncle, about 2 inches 

 high, bearing at the top a globular capsule, of a blackish- 

 green colour, which bursts into 4 roundish-oval, smooth 

 segments, in the centre of which are black, elastic hairs, 

 exploding a yellowish brown powder." Such is LIGHT- 



