Rieeia glauca, Linn.
Frond dichotomous ly divided, su b s t e l la t e ;
lacinias obovately- linear , emarginate, bilobate,
plane, channelled at the apex, p un c ta te ;
margin membranaceous, of the same colour
beneath.
Riccia glauca, Linn. Sp. 160 5 ; Eng. Bot.
t. 2546; Lindenb. Mon. p. 4 17 , t. 19 ; Cooke
Hep, fig. 197 ; Carr, and Pears. Exs. No. 138.
Riccia crystallina a. Hook. Eng. FI. V., i
p. 98. ' ’
In glaucous green tufts, on moist ground (Fr
Spring.) ^ ^ •
var. a major, Roth. Frond radiate, lacinias
obovate or obcordate, rather bilobate, crenate
at the apex, extremit ies plane or ch an n e l le d__
Lmd. Mon. t. xix., f. 12, 13.
Lichen minor, Di llw. Muse. 533, t. 78, f. 10.
var. /3 minor, Lind. F ro n d and lobes somewha
t triangular, sulcate.— Lind. Mon. t. xix
(figs. 14, 15).
Lichen minor, Di llw. Muse. 533, t. 78, f. 13.
Fronds forming roundish patches, conspicuous
by their glaucoifs hue. O f a
thick rather fleshy substance,
and firmly fixed to the soil
by fibrous radicles (fig. I95).
Fruit disposed beneath the
surface, - - V2W1 Iinll jfuuiriruowwbs irdaadiiaaLtiinng
from the centre of the frond, and running alon
the middle of each lobe and segment, when ripe
they rupture the cuticle, and the minute spores
are copiously ejected.
Rieeia bifurea, Hoffm.
Frond tumid, fiabellate, dichotomously
divided, laciniæ elliptic-obovate, or wedg e -
shaped, emarginate, bilobate, lobes divergent,
punctate, margin thickened, elevated, rounded,
broadly sulcate, purplish beneath. Disc
near ly plane, g laucous green.
Riccia bifurea, Hoffm. FI. Germ. 95 ; L in denb.
Mon. 425, t. XX. , f. I ; Carr, in Grev.
II., 88.
On limestone rocks, &c., in patches 2 to 3 inches
in diameter.
Segments of the fronds three to six lines long,
one line broad, contracted at each end, and spathu-
late, with a bold tumid border, most conspicuous
near the apex. Rootlets numerous. Sporangia
scattered irregularly over the disc. Spores threeangled,
dark brown, reticulately muricate.— {Plate
à, fig. 79)
Riccia crystallina, Linn.
Frond oblong, two-lobed, forked, the divi sions
re v e r s e ly heart-shaped, margin rather
crenate, of the same colour beneath. Surface