BRITISH JUNGERMANNEE. 
(J. emarginataj 
JUNGERMANNIA EMARGINATA. 
(TAB. XXVII.) 
Jungermannia, caule erect o, ramoso : foliis bifariis, laxh imbricatis, patent ibus, obcordatis, 
emarginatis : fructu terminali ; calycibus ovatis, perichaetio iinmersis. 
Jungermannia emarginata. Ehrhart, Beitr. Band. m. p. 80. Schrader, Samml. u. p. 4. 
Schrader, Spic. FI. Germ. p. 75. Hoffmann, Germ. ii. p. 82. Roth, Germ. hi. p.367. 
Engl. Bot. t. 1022. Linn. Syst. Nat. ed. Gmel. n. p. 1348. 
Jungermannia macrorhiza. Dickson, Crypt. Fasc. ii. p. 16. t.b.f. 10. Linn. Syst. Nat. 
ed. Gmel. ii. p. 1349. With. iii. p. 854. 
Bab. Plentiful in the alpine districts of England, Scotland, and Ireland, delighting in 
very wet places; even in the waters of rapid torrents, and in situations where it is 
continually exposed to the spray of a water- fall. It bears fructification in the early 
months of summer. 
Plant growing in large patches, more or less densely crowded. 
Roots proceeding almost entirely from the lower and leafless part of the stems, from half 
to three-quarters of an inch long, nearly as thick as human hair, rigid, often branched. 
Stems from one to three, or even four inches long, filiform, or increasing somewhat in 
size towards the extremity, erect, sometimes simple, but more frequently once or twice 
bifid, with segments of uncertain length, and, besides, producing innovations, which are 
either lateral, or originate, in clusters of three or four, from the bosom of the terminal 
leaves : their texture is somewhat ligneous; when dry, very brittle. 
Leaves from a quarter to half a line long, at the base of the plant almost always much 
decayed, but more perfect, and of a larger size, towards the centre of the stem: they are 
bifarious and distichous, loosely imbricated, patent or erecto-patent, nearly obcordate (f.o), 
semiamplexicaul at their base; the lateral margins, especially that part of them which 
is nearest the stem, much incurved, the apex divided, by a rather deep and acute 
notch, into two very obtuse rounded segments: the texture rather firm; the cellules 
extremely minute, roundish: the color exceedingly variable in different situations; in 
less moist, but more exposed places, it is generally of a deep brownish purple hue; 
when found in rivulets, as Dr. Smith well observes, it loses its purple tints and becomes 
dark green. 
