closely imbricated and placed alternately,
divided into two unequal lobes (fig.
41), the upper much the largest, convex,
smooth, roundish, ovate, margin
sometimes entire, sometimes dentate
with unequal spinulose teeth, at irregular
distances. The inferior lobe scarcely
one-third so large, obliquely adpressed,
oblong or ligulate, margins dentate,
teeth occasionally recurved. Stipules
one to each pair of leaves, oblong-
quadrate, resembling the smaller lobe,
spinulose dentate at the margin.—
Porella platyphylla, Linn.
Stem procumbent, bipinnatel}^ branched,
leaves rounded-ovate, and, as well as the
auricles and strap- like stipules, quite entire.
Involucral leaves toothed or entire.
Jungermannia platyphylla, Linn. Sp. 1600;
Eng. Bot. t. 798 ; Hook. Br. Jung. t. 40.
Madotheca platyphylla, Dumort. Comm., p. 1 1 1 ;
Got t . and Rabh. Exs. No. 51, 157, 158, 363,
3 6 4 ; Co o ke Hep. f. 143, 144, 145. Lejeunia
platyphylla, Corda. in Sturm. FI. X X I I . , t. 26.
Porella platyphylla, Carr, and Pears. Exs.
No. 71.
On trunks, &c.
var. ^ major, v a g u e ly bipinnately branched,
J
leaves large, smooth, greenish y e l low.— Hook.
B r . Jung. t. 40, /. 4,
42.
Old walls, rocks, and trunks. (Fr. March, April.)
Grows in considerable patches. Stems i to 2
or 3 inches long, flexuose, often pinnate, with
straggling branches,
which are again
shortly branched.
Leaves closely imbricate
in two rows,
so as to conceal
the upper part of the stem
(fig. 42), unequally two-
lobed, the upper lobe the
largest, alternate, ovate, approaching
round, slightly
concave, margins incurved,
entire, or here and there
44. 45-
slightly toothed, lower lobe strap-shaped, diagonally
pressed to the surface of the upper, plane, margins
recurved and entire. Colour, deep or blackish
green, opaque. Perichaetial leaves like the cauline,
but smaller, and the lobule proportionately larger,
two to each calyx, stipules adpressed, oblong ovate.
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