í M :
i :
i
íi!
■W H.H del et litL, lleevc B c r lu i ii & Ueeve im£
P l a t e CLXX.
RYTIPHLÆA COMPLANATA, A g .
Gen. C h a k . Frond filiform or compressed, pinnate, transversely striate,
reticulated ; the axis articulated, composed of a circle of large, tubular,
elongated cells [siphons), surrounding a central cell; the periphery
of several rows of minute, irregular, coloured cellules,
of two kinds, on distinct individuals; 1, ovate capsules {ee:
containing a tuft of pear-shaped spores; 2, tetraspores, contained in
minute, lanceolate reeeptacles [stichidia), in a double row. E y t ip h l jEA
[Ay.),—from pvTis, a wrinhle, and fiXoios, the ia r k ; because the surface
is transversely wrinkled or striate.
R y t i p h læ a complanata -, frond brown-red, compressed, pinnate, or bi-tri-
pinnate, the lower pinnæ short or abortive, the upper long, straight,
erect, virgate, once or twice compounded ; pinnulæ subulate, or bifid,
erect, closely-set; the axils acute.
E yt iphlæa complanata, Ag. Sp. Alg. vol. ii. p. 54. J. Ag. in Linn. vol. xv.
p. 26. J. Ag. Alg. Medit. p. 146, Fndl. 3rd Suppl. p. 48. H a n . Ner.
Austr. p. 32.
P olysiphonia cristate, H a n . in Mack. FI. H ii. part 3. p. 205. H a n . Man.
p. 85.
F u cu s cristatus, var. y. axticulatus. Turn. Hist. t. 2 3 ./. h.
P locamium cristatum, Lanumr. Fss. p. 50. t. 5. f. 1, 2, 3.
H ab . On the rocky beds of shallow tide-pools, exposed, at low-water, to
fuU sunshine, among Corallina officinalis, &c. Perennial ? Summer.
Very rare. Bantry Bay, Miss Hutchins. Caarush Point, Mütown
Malbay, abundant in one or two tide-pools, but very local, W. H . H .
(1847). Whitsand Bay, B r . Jacob. Dredged in Plymouth Sound,
Rev. W. S. Hore.
Geogr. Distk . Atlantic coasts of France and Spain. Mediterranean Sea.
South of England and Ireland. Cape of Good Hope.
D esc r . Root, a mass of branched, creeping, and clasping fibres. Fronds densely
tufted, from two to four inches high, about half a Une in breadth, piano-
compressed, simple, or once forked below, flabellately branched, or more or
less pinnate, or bi-tri-pinnate above. Lower portion of the stem either
naked, or set with short subulate or pinnatifid ramuh ; upper branches
pinnate with branchlets, which increase in length and in composition upwards,
the lowermost being simple, the upper pinnatifid, and the uppermost more
compound stiU. All the divisions are strictly alternate and distichous, and
the whole frond is marked with arching, transverse striæ, or dark lines,
placed at distances of about half the diameter asunder : these indicate the
joints of the internal axis, seen through the cells of the surface. Ramuli
subulate, the older ones becoming bifid, and gradually multifid. I have
seen no fruit on British specimens. Substance cartilaginous, not closely
ni A ftU