Obs.—This is the commonest species known, being at once
recognised by the presence in the antical and postieal lobes of a
pseudo-nerve, which is often colourless, and consists of a series of
from 4 to G elongated cells, a cross-section of the leaf showing the
cells to be of equal diameter witli others, the outer wall only
thickened considerably.
D escription oe P late XCVII.—Fig. 1. Plant natural size.
2. Stem X 24 (Nova Scotia, Macoun). 3, 4. Leaves x 16
(Killarney, Lindberg). 5. Portion of leaf x 290 (ditto). 6. Cross-
section of leaf X 85 (France, Du Buysson). 7. Bract x 24
(ditto). 8. Perianth x 24 (ditto). 9. Portion of mouth of
perianth x 85 (C. & P. Hep. Brit. Ex. n. 220). 10. Perigonial
stem X GO (ditto), 11. Perigonial bract x 24 (ditto).
2. Diplophyllum taxifolium (7Fa/i/e«i.), Bum.
.Jungermania tcmfoUa, Wahlenb. El. Lapp, p, 383, t. 25, f. A -0 . (1812).
Jungermania albicans, var. laxifolia, Nees, Nat. Eur. Leb. 1, p. 228 (1833).
Diplophyllum taxifolmm, Dum. Recueil, p. 10 (1835).
Dioicous; growing in dense, depressed tufts, small to medium
size, of a greenish to reddish-brown colour. Stems simple o r
ramose, sub-erect to erect, radiculose. Leaves bifarious, a little
distant or contiguous, conduplicate, unequally divided to below
the middle, margin entire or minutely denticulate, antical lobe
about i io ^ the size of the postical, incumbent, patent to
patent-divergent, 40°-60°, oblong-oval to ovate, rotundate ; postical
lobe spreading at right angles or slightly ascending, divm-gent
or horizontal, 80°-90°, oblong-oval to lanceolate; cells minute to
rather minute, subquadrate, cell-walls thick, no trigones. Bracts
similar to the leaves, larger, Perianth terminal, obovate, upper
portion 5-plioate, mouth contracted, laeiniate-denticulate. Pistillidia
about 20.
The male plant I have not seen.
Fruits May, June.
Dimensions.—Stems from ^ to ^ inch long, diameter A mm. ;
leaves, antical lobe L mm. x ’4 mm., postical t'2 5 mm. x A mra.!
antical '7 mm. x A5 mm., postical 1' ram. x '4 mm.; cells '015 mm.
bracts, antioal lobe IT mm. x '6 mm., postieal 1'4 mm. x '6 mm. ;
perianth 1'75 mm. x '9 mm., 2'25 m m . x 1'25 mm. ; pistillidia
•2 mm. X '05 mm.
H a b.— On rocks in alpine situations.
7. The Glyders, Carnarvonshire, W. Wilson, 1844. 15. Ben
Lawers, Perthshire, Beu. C. II. Binstead, identified and comm, by
G. A. Hott. 16. Moidart, West Inverness, S. M. Macvicar.
In similar localities on the Continent, in North America and
Canada.
O b s .—This species has usually been considered a variety of
the previous one, but Prof. Lindberg regarded it as distinct, its
neater habit, generally smaller and more graceful form, the
direction of the postieal lobe being more horizontal, the lobes
generally more rounded, the absence of the pseudo-nerve—
although traces are sometimes observable—sustain this view.
D escription oe P late XCVIII.— Fig. 1. Plants natural
size. 2. Stem x 16 (Thed. 197). 3. Portion of stem x 31
(Norway, Lindberg). 4. Leaf x 24 (ditto). 5. Portion of leaf
X 290 (ditto). 6, 7. Bracts x 24 (ditto). 8. Perianth x 24
(ditto). 9. Portion of mouth of perianth x 85 (ditto).
10. Pistillidium X 85 (ditto).
3. Diplophyllum obtusifolium fflook.). Bum.
lia. Hook. Brit. Jung. t. 26 (1816).
Diplophyllum obtusifolium, Dum. Recueil, p. 16 (1885).
Paroicous or monoicous, densely cæspitose, small, green,
greenish-brown or brown in colour. Stems simple or innovantly
branched, postical side of stem often of a reddish tinge, sub-erect
or ascending ; radiculose up to apex, rootlets thick, dense, long,
hyaline. Leaves accrescent, bifarious, imbricate, conduplicate,
unequally bifid to about the middle, margin minutely denticulate
or entire, antioal lobes 2 or 3 times smaller than the postical,
incumbent, erect or erect-patent (l0°-20°), ovate or oblong, obtuse
or acute, postical lobe horizontal or slightly ascending (90°-80°),
Q