I 'la / r r .YVI ’
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P l a t e C X X V .
CALLITHAMNION SPONGIOSUM, Haw.
G e n . C h a e . Frond rosy or brow n ish -red , filam e n to u s ; stem e ith e r opake
and cellular, or tra n s lu c en t an d jo in te d ; b ran ch es jo in ted , on e -tu b ed ,
m ostly p in n a te (rarely dichotomous o r ir r e g u la r ) ; dissepiments hyaline.
F rn ii of two k in d s , on d is tin c t p l a n t s ; 1 , ex te rn a l tetraspores, s c a tte
red a lo n g th e u ltim a te b ran c ld e ts, or b o rn e on little p e d ic e ls ; 2,
ro u n d ish or lobed, b e rry -h k e receptacles (fa v e lla ) sea ted on th e m a in
b ranches, a n d c o n ta in in g n um e ro u s an g u la r spores. C a l l i t h a m n i o n
(Lyn g i.),— froui sahXis, beautiful, a n d Bagviov, a little shrub.
C a l l i th a m n io n spongiosum-, stems robust, cartilaginous, more or less
opake and veiny, branched in every direction ; branches thickly set
with dense, quadrifarious, repeatedly dichotomous, round-topped
branchlets; axils p a te n t; apices short, bifid ; articulations of the
branches swollen at the joints, twice or thric e as long as broad.
Callithamnion spongiosum, Harv. in Hook. Br. M. vol. ii. p. 346. Harv.
in Mack. FI. Hih. p a rt 3. p. 317. Harv. Man. p. 113. W-gatt, Alg. Banm.
no. 93. Crouan, in Bezm. FI.
H ab. On perpendicular submarine rocks, near low-water mark, and para-
sitically on other Algæ. Annual. Summer. Dunleary (1802), i f r .
Larne, B r . Brumm,ond. Torquay, Mrs. Griffiths. Kings-
towui Harbour and KiUiuey, W .II.H . Salcombe, Mrs. Wyatt. P ly mouth,
Rev. W. S. Bore and Mr. Rohloff. Land’s E n d and Efra-
combe, M r. R a lfs . Jersey, Miss White. Saltcoats, and Largo, Eife,
Rev. B . Landsborough. Kilbride, Mayor M a rtin . Ealmouth, Miss
Warren.
Geoge, Dis t e . Britisli Islands, and Atlantic shores of France.
Desc e, Fronds tufted, two to four inches high, with a conical outline, flaccid,
soft, holding water like a sponge. Stems thicker than bristle, more or less
opake and veiny, branched in every direction, and thickly clothed with
short ramuli. Branches long, sparingly divided, but veiy densely clothed
with quadrifarious secondary branches, the lowermost of which are longest,
the rest gradually shorter upwards ; these are, in luxuriant specimens, furnished
with a second or third series, the penultimate ones being linear-
obovate and round-topped in outline, and densely set throughout their
length with short, dichotomous ramuli. Bavmli repeatedly dichotomous,
with patent axils, forking at every joint ; apices short, bifid and very obtuse.
Tetraspores elliptical, solitary, sessile in the forkings of the ramuli, triparted.
Favelloe large, and generally bi-lobed, the lobes roiindisb, placed at the
summits of abbreviated branches, frequently surrounded by two or three
dichotomous ramuli. Substance flaccid, membranaceous, but not gelatinous,
destitute of gloss when dry. Colour a dull purplish- or brownish-red. Articulations
of the main stems more or less filled with longitudinal veins ; those
of the branches and branchlets with a very narrow coloured tube, surrounded
if ].\\\
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