P l a t e L X IV .
ARTHROCLADIA VILLOSA, Duby.
Gen. Chae. Frond filiform, cellular, with an articulated, tubular axis,
nodose; the nodes producing whorls of delicate, jointed filaments.
Fructification; pedicellate, moniliform pods, borne on the filaments,
and containing, at maturity, a string of elliptical spores. Aetheocladia
[Buhy)—from apSpov, a, joint, and kASSos, a hraneli.
A e th e o c l a d i a v i
A e t h e o c l a d i a villosa, Buhy, Mem. Ceram, p. 18 (1832). J. Ag. Alg. Medit.
p. 43. Endl. 3rd Suppl. p. 25. Xütz. Phyc. Gen. p. 344.
E l a i o n e m a villosum. Berk. Glean, p. 49. 1 .19. f. 3 (1833).
p. 28.
S p o e o o h n u s viUosus, Ag. Sp. Alg. vol. i. p. 155. Ag. Syst. p. 260.
Grev.
Alg. Brit. p. 42. Hook. B r. El. vol. ii. p. 274. Wyatt, A lg. j
. no. 105.
Harv. in Mack. PI. Hib. part 3. p. 173.
C o n f e r v a viUosa, Huds. El. Ang. p. 603. With. vol. iv. p. 141.
E .B o t.
t. 546. Billw. Conf. t. 37. Both. Cat. Bot. vol. iii. p. 314.
H ab. On submarine rooks, shells, &c., and on Zostera, in four or five
fathoms water, rare. Annual. Summer and Autumn. Southern
coasts of England, not uncommon. Yarmouth, Turner. Anglesea,
Rev. H. Bavies. Erith of Forth, Mr. HaselL Ardthur, Capt. Carmichael.
Wicklow, W. H. H. Malahide, and Carrickfergus, Mr.
Mc’Calla. Jersey, Miss White aud Miss Turner.
G e o g e , D i s t r . Atlantic shores of Em-ope. Baltic sea, Mediterranean sea,
(very rare).
D e s o r . Boot, a minute disc. Eronds several from the same base, from six
inches to nearly tlu-ee feet in length, very slender, once, twice, or thrice
pinnated ; the pinnæ distant, opposite, or rarely alternate, patent, simple or
again pinnated with similar, simple pinnules ; all the branches furnished at
intervals of from half a line to a hne, with minute, knob-like swellings which
produce whorls of very delicate, byssoid, repeatedly pinnate jointed filaments
of a pale green colour. The substance of the frond is traversed by a
wide tube, about one third of the width, which is di-pided by transverse septa
into joints or chambers, whose length is rather less than their breadth, and
four or five of which interpose between every whorl of filaments. This
tube is sm-rounded by a row of large cellules, and these again by several
rows of smaUer ones, which gradually diminish to the ch-cumference. The
substance when quite fresh is cartilaginous, but it soon becomes flaccid.
Fructification ; minute, articulated, lanceolate pods {stichidia) home along
the sides of the whorled filaments ; at first short, finaUy much lengthened,
moniliform, aud containing, at maturity, in each joint, an oval spore of an
oUve colour, which at length bursts through the membrane and falls away.
In drying it adheres firmly to paper.
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