in “ Eng. Bot. Suppl.” tab. 2947 (Oct. 1, 1848) by Dr. Spruce,
who discovered it in Eskdale, December 1842.
Distinguished from Jung, pumila. With, and Jung, sphærocarpa,
Hook., which are both paroicous, by the insertion and shape of
leaves and olavate perianth ; some forms of Jimg. riparia,
Tayl. might he taken for lanceolata, but riparia is always
dioicous.
D escription of P late CXX.—Pig- 1- Plants natural size.
2. Portion of fertile stem x 11 (C. & P. n. 170). 3. 4. Leaves
X 16 (ditto). 5-7. Leaves x 24 (Canada, Maooun). 8. Portion
of leaf X 290 (C. & P. n. 170). 9, 10. Bracts x 24 (Canada,
Maooun). 11. Cross-section of perianth near the middle x 24
(ditto). 12. Apex of perianth x 16 (ditto). 13. Portion of
the mouth of the perianth x 85 (ditto), 14. Pistillidium x 85
(ditto). 15,16. Perigonial bracts x 16 (ditto). 17. Antheridium
x 85 (ditto).
Genus 30. JAMESONIELLA, Spruce.
Jamesonmlla, Spruce, Jo u rn . of Bot. (1870).
Large, showy, cæspitose, rosy or pale. Stems often suberect,
sparingly and fastigiately branched, flagelliferous, circinnate ;
branches postioo-Iateral. Leaves large, alternate, succubous,
laterally appressed, decumbent, remarkably decurrent at the base,
insertion oblique, very concave, quite entire or very distantly
ciliate or denticulate ; cells small or minute, semipellucid, beautifully
thickened at the angles. Stipules none or very rare and
minute, except near the involucre. Infloresoenoe dioicous ; ?
flowers terminal, with innovations below ; bracts and interposed
bracteole much laoiniated. Perianth more or less projecting
beyond the bracts, towards the apex 6-10-plicate, mouth scarcely
denticulate. Capsule, &c., not seen. $ cauline, very often
terminal, perigonial bracts equalling tbe leaves, 2-3 androns.
Jamesoniella Carringtoni [Balf.), Spruce.
Adelanthus Carringtoni, Balf. MSS. Carr, in Trans. Bot. Soc. Edin. p. 378
(1870).
Nardia Carringtoni, Carr. Brit. Hep. p. 27 (1874-6).
Nai'dia compressa, var. Carringtoni, Lindb. in H ep. Hibern. in Act. S ic. Sc. Fenn.
(1876).
.Jamesoniella Cai-ringtoni (Balf.), Spruce, Journ. of Bot. (1876).
Dioicous, cæspitose, flagelliferous, largish to very large, pale
or olive green in colour. Stems procumbent or suberect, simple or
innovantly branched, branohes postioal-Jateral, rootlets slender,
few, whitish, fasciculate ; firm, flexuose, brownish colour, apex more
or less circinnate. Leaves alternate, succubous, laterally appressed,
obliquely inserted, secund, very concave, imbricate, regular, lower
ones minute, distant, subrotnnd or cuneate ; obliquely orbicular
or reniform, antical base very decurrent, postical semicordate,
ampliate, abruptly and very narrowly deourrent, margin entire or
furnished with few large teeth, 1-6 ; epidermis polished, texture
firm, subpelluoid, little altered when dry, cells from very small to
medium size, roundish, walls thick, trigones distinct, angles
thickened. Stipules absent or rudimentary, towards apex of stem
or branohes, very minute, sublinear, much narrower than the stem,
appressed; to about the middle or base unequally or equally
divided, segments subulate. Androecia at apex of stem or branch
or on lateral branohes, spicate, perigonial bracts 6-10 pairs, a
little smaller, turgid, antical lobule narrow ; antheridia at base
solitary (2-3, Dr. C.), spherical, mixed with parapliyses.
D imensions.—Stems 2 to 4 inches long, diam. ’2 mm., with
leaves 1'5 mm. to 1'75 mm. wide; leaves 1'5 mm. high from the
deourrent base x 1'4 mm. broad, 1'3 mm. x 1'3 mm., 1’2 mm.
X 1-4 mm.; teeth T25 mm. long; cells ’035 mra., -03 mm.,
■0225 mm., '02 mm. ; cell-walls '0075 mm. ; trigones '01 mm. ;
stipule '2 mm. long x '05 mm. broad at base; antheridia '14 mm.
X T2 mm.
H a b .—Growing on wet rocks and damp rocky ledges in alpine
districts in Scotland. Very rare.