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P l a t e CCCXXVI.
DICTYOSIPHON FOENICULACEUS, Grev.
G e n . C h a e . Boot a small, naked disc. Frond filiform, tubular, branched ;
its walls composed of several rows of cells, of which the inner are
elongated, and connected in longitudinal filaments ; the outer small,
polygonal, forming a membrane. Frnctification, solitary or aggregated
naked spores, scattered irregularly over the surface. D io t y o s
i p h o n ( Grev.),—from hisrvov, a net, and mtfxav, a tube ; because the
frond is hollow, and has a netted surface.
D io t y o s ip h o n fm ic n la c e n s -, frond setaceous, very much branched;
branches capillary, decompound; ramuli subulate, alternate or scattered,
rarely opposite.
D iotyosiphon foeniculaceus, Grev. Alg. Brit. p. 56. tab. viii. Hooh. B r.F l.
vol. ii. p. 279. Wyatt, Alg. Danm. no. 205. Harv. in Mach. M. H é .
pari 3. p. 176. Harv. Man. ed. 1. p. 32. ed. 2. p. 40. J. Ag. Sp. Alg.
vol. i. p. 82. Kütz. Sp. Alg. p. 485. Aresch. Phyc. Scand. p. 147. t. 6,
7,8 (in part). E. Bot. Suppl.
ScYTOSiPHON foeniculaceus, Ag. Sp. Alg. vol. i. p. 164. Ag. Syst. p. 258.
Lyngb. Ilyd. Ban. p. 63. 1 .14.
Fuous subtilis, Turn. Eist. t. 234.
Conferva foeniculacea, Huds. PI. Angl. vol. ii. p. 594. Light. M . Scot. vol. ii.
p. 981.
CoNFEEVA marina foeniculacea, Dill. Hist. Muse. p. 16. t. 2. f. 8.
H a b . In rock-pools, between tide-marks, either o n stones, or growing pa-
rasitically on other Algæ. Annual. Spring and summer. Common
on the coast.
Geoge. D is t e . Atlantic shores of Europe and of North America. Baltic Sea.
D e sc e . Root a very small disc. Siem from six inches to one or two feet
or more in length, varying from a quarter to half a line in diameter, generally
undivided, but densely furnished throughout its enthe length with
lateral branches. Branches long, simUar to the stem, and excessively
branched in a very irregular manner. Sometimes the secondary branches
are very densely set, capillary, elongated and simple, or nearly so. Sometimes
they are short, curved, and twice or thrice divided. Commonly they
are decompound and bushy, plentifuhy fuimished with subulate, acute ramuli,
which are either scattered or rarely opposite. When young, the whole
frond is densely clothed with pellucid, jointed hairs. I t is at first solid,
but the central cells, which are much larger than the rest, are also weaker
and soon perish, leaving the stem and branches fistular. The walls of the
tube are composed of several layers of longitudinally connected cylindncal
cells, of which the inner ones are elongate, the rest graduaUy shorter; the
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