L
î I
Riccia sorocarpa, Bisch.
Segments of the frond linear, subdichoro-
mous, carinate-sulcate, green on both surfaces ;
lobes thick and fleshy, oblong, obtuse, or
emarginate ; margin thin, glabrous, inflexed
when d ry ; fruit scattered along the mid-vein.
Riccia sorocarpa, Bisch. Hep. Nov. Ac t . N.
Cur. X V I I . , p. 1053, t. 71, f. I I ; Gotc. and
Rabh. Exs. 23, 543 ; Carr, in Grevil lea, II.,
p. 88 ; Carr, and Pears. Exs. No. 1 3 9 ; Braith.
Grevillea, I., p. 144.
On limestone rocks and moist walls.
Fronds forming shallow strata, crowded and
entangled, so as to be separated with difficulty ;
colour pale glaucous green. Segments one to three
lines long, one-quarter to one-third line broad. Pistillidia
scattered along the carinate base of the lobes,
young fruit immersed, at length elevating the epidermis,
which it ruptures to allow the escape of the
spores.
Spores smaller than in R . bifurea, dark brown,
crenate-reticulate— {Plate 6, fig. 80.)
Riccia tumida, Lindenb.
Frond near ly simple, oblong- linear, obtuse,
thickened about the apex beneath, and at the
margin, above channelled, b e low purplish ; the
margin s ingly, the apex doub ly ciliate.
Riccia tumida. Linden. Mon. 459, t. xxvii.,
fig. 2 ; Carr, and Pears. Exs. No. 67.
Frond two to three lines long.— {Plate 7, fig.
92.)
This may be recognised amongst British species,
with a purplish under surface, by the ciliated
margin, in which respect it differs from R. nigrella,
as well as in its thicker substance.
Riccia nigrella, De Cand.
Frond dichotomous ; laciniæ linear, channelled
; margin membranaceous, quite entire,
dark purple beneath ; transve r se ly scaly, scales
semi-circular, not exceeding the margin.
Riccia nigrella, De Cand, FI. Fr. V., p. 193 ;
Lind. Mon. p. 467, t. xxix., fig. i ; Carr, and
Pears. Exs. 65, 290. Riccia lamellosa, Ralfs.
Co o k e Hep. No. 133.
On damp banks.
Small in all its parts, with linear dichotomous
lobes, margin membranous, entire, expanded, and
dark green when moist, but when dry remarkably
inflexed, and displaying the dark purple scales
which clothe the lower surface, and which are
rounded and closely imbricate.— {Plate 6, fig . 8ii)
Sub-Genus i . RICCIOCARPUS, Corda.
F ru i t immersed in the frond, and protu