The English flora - SeaweedAfrica

Rhodomenm.] ALG.E INARTICULATE. 289
—Name; go2o:, red, and vpw, a membrane.— This seems to differ
from some of the Nitophylla, solely in the ternate granules being
scattered over the whole surface of the frond, not collected into
definite spots.
—
1. R. bifida, Grev. (bifid Rhodomenia); frond thin membranaceous
dichotomously divided broadly linear, the segments often
subcuneate obtuse, capsules hemispherical chiefly marginal.
Grev. Alg.Brit.p. 85. Delesseria bifida, Lam our-.— Sphcerococcus
bifidus, Ag. Sp. Alg. v. 1. p. 299. Hahjmenia bifida, Gmel.—
Fucus bifidus, Good, et Woodiv. in Linn. Trans, v. 3. t. 17. f. 1.
E. Bot. t. 773. Turn. Syn. Fuc. p. 163, Hist. Fuc. t. 15-J
/3. ciliata; frond somewhat cartilaginous purplish-brown opaque
divided, the margins fringed with spathulate laciniae. Turn. I. c.
On rocks and the larger sea-weeds, not unfrequent on the coast of the
south of England, especially of Devonshire and Cornwall. Norfolk and
Suffolk. Tynemouth. Belfast and Bantry, Ireland: ©.Summer.— The
more usual state of this plant is of a beautiful deep rose-red, the margins
free from laciniae or nearly so ; but the ciliated variety is so beset with
linear, or, more frequently, spathulate laciniae, and is so copiously divided,
that it can hardly be recognised as the same species ; its colour is much
less bright, and its texture thicker and more opaque. From Mrs.
Griffiths I possess numerous specimens. In some of these the capsules
are by no means confined to the margin. The scattered granules are
principally in the extremities of the frond, often, however, extending a
good way down : frequently in the marginal laciniae. The spreading
fronds are from one to three inches in length.
2. R. lacinidta, Grev. (Jaciniated Rhodomenia); frond subcartilaginous
palmatedly dichotomous, the segments broadly
linear-oblong obtuse or erose often fringed with marginal la-
cinia? (linear or lanceolate) in which the sphaerical capsules are
situated, scattered granules marginal.— Grev. Alg. Brit, p. 86.
—Delesseria laciniata, Grev, Fl. Edin.— Hook, in 11. Loud. X.
Sir. cum Ic.— Fucus laciniatus, Buds.— Turn. Syn. Fuc. p. 161,
Hist. Fuc t. (19. E. Bot. t. 1068.
More or less abundant upon all the coasts of Great Britain: \