The lumen of the cells being clear and the thick walls and
angles ol' a brown colour, the leaves appear to be punctate,
bringing into prominence the feature which gives the name to
this plant.
I t is more variable in size than P. spinulosa, often growing in
small dense qmlvinate tufts, very closely entangled, about ^ inch
high.D
eS' RiPTioN OE P late CXVII.—Pig. 1. Plants natural size.
2. Portion of stem x 24 (Killarney, Dr. Carrington). 3, 4.
Upper leaves x 24 (original, Herb. Taylor). 5, 6. Lower leaves
X 24 (ditto). 7. Portion of leaf x 290 (ditto). 8, 9. Bracts
X 24 (Killarney, Dr. Carrington). 10. Perianth x 24 (ditto).
11. Pistillidium X 85 (ditto).
6. Plagiochila trid en ticu la ta , Tayl.
Jungermania spinulosa, var. tridenticulata. Hook. Brit. Jung. p. 9, t. xiv. ff. 9,
10 (1816)?.
Radida cornicidata, Dum. Syll. Ju n g . p. 13 (1831)?.
Rlagiochila corniculata, Dum. Recueil, p. 15 (1835)?.
Plagiochila tridenticulata, Dum. Recueil, p. 15 (1835)?.
Plagiochila tridenticulata, Taylor in G.L.N. Syn. Hep. p. 26 (1844).
Dioicous, densely cæspitose or rarely creeping, small, of a
dark indigo-green colour, when dry almost black. Stems filiform,
flexuose, dark brown, erect, ramose, branohes lateral ; radiculose,
rootlets dull white, ascending almost to apex of the stem. Leaves
obliquely inserted, patent to divergent-patent, 60° (from 50° to
70°), distant or approximate, alternate, oblong-ovate or cuneate-
ovate, from a narrow base, caducous, 2-3-lobulate, bifid or less
often trifid to about ^ or sinus rounded or acute, segments
acute or apiculate, margin entire ; texture somewhat firm, cells
small, roundish, lumen clear, walls thick, angles thickened and
pale brown, no trigones. Stipules wanting or rudimentary.
Perigonial bracts middle or end of the stem, 3-5 pairs, closely
imbricated, more erect, semi-amplexicaul, ventricose at the base,
ovate, trifid ; antheridia spherical.
Female plants not seen.
w
1 inch long, diam. T mm., with
mm. X '4 mm., segments '3 mra.,
D imensions.—Stems J to
leaves 1' mm. wide; leaves
'7 mm. X '3 mm., seg. '2 mm., ’65 mm. x '4 mm., seg. '3 mm.;
cells -03 mm., '02 mm., '0175 mm., '015 mm. ; oell-walls '01 mm.;
perigonial bracts '7 mm. x '55 mra., seg. '2 min. ; antheridia
T mm.
H ab.— Growing on rocks or trees in shady places. Rare.
7. Tyn-y-Groes, Merionethshire, G. J. Wild, G. A. Holt, Dr. Carrington,
W. II. P . ; Dolgelly, Merionethshire, W. Wilson, K George;
Aber, Carnarvonshire, W. Wilson; Llanberis, Carnarvonshire,
W. I I P.; 12. Keswick, C. Lyell, 1812 ; Dr. Carrington fl W. I I P.,
1884. 13. New Galloway, /. McAndrew. 16. Moidart, West
Inverness, 8. M. Macvicar fl W. I I P. ; Scotland, W. Wilson.
South of Ireland, Dr. Taylor, and others. Bantry, Glengariffe,
Killarney, &c.
The Play, tridenticulata, Tayl., reported as oolleoted in Cornwall
hy the late Wm. Curnow, belongs to another species.
O b s .—Distinguished from Plagiochila punctata, Tayl., by its
smaller size, compact habit, darker colour, oblong-ovate, cuneate
leaves, which are only bifid or trifid, and which when dry easily
fall off, leaving only the naked stem.
When dry"it turns almost black, and is then at once distinguished
from any of the other Plagiochilw.
I t is very doubtful whether Hooker’s .lung, spinulosa, var.
tridenticulata, is this species; the figures given m his “ Bnt.
Jung.” certainly do not represent it.
Plagiochila iridenticulata, Dum. Recueil 1835, and Plagiochila
corniculata, Dum. Recueil 1835, are both founded on Hooker’s
■Tung, spinulosa, var. tridenticulata, whioli probably is not the same
as Taylor’s species. Dr. Spruce remarked in a letter, “ the specific
name is not a very happy one, for ‘ denticulata’ means only rudi-
mentarily toothed, whereas the leaves of this plant are decidedly
2-3-lobulate.”
D escription of P late CXVIIL—Pig. 1. Plants natural size.
2. Plant X 24 (Tyn-y-Groes,NorthWales,W.H.P.). 3. Portion
of stem X 24 (ditto). 4. Leaf x 85 (ditto). 5. Portion of