ccm
H.B. JbR. mp.
Ser. E h o d o s p e rm eæ . Fam . Ceramieoe.
P l a t e CCLV.
CERAMIUM FASTIGIATUM, Harv.
G e n . C h a b . Frond filiform,, on e riu b ed , a r tic u la te d ; th e dissepiments
coated w itli a s tra tum of coloured cellules, wliiob sometimes extend
over th e surface:of th e . a rticu la tio n . Fructification of two k in d s on
d is tin c t ind iv id u a ls ; 1, tetraspores e ith e r immersed in th e ram u li or
more or less ex te rn a l ; 2, sessile,, ro u n d ish receptacles (favelloe) hav in g
a p ellucid lim bus, co n ta in in g m in u te , a n g u la r spores, a n d su b ten d ed
by one o r more sh o rt, in v o lu c ra l ram uli. C beamium {Both),— from
Kspapos, a pitch e r ; b u t th e fru it is not pitch e r-sh ap ed .
Cebamium fa stig ia tum ; frond capillary, of equal diameter throughout,
flaccid! dichotomous, level-topped ; the axils acute ; articulations pellucid,
those of the middle of the stem from four to six times longer
than broad, the upper gradually shorter, and coloured ; dissepiments
coated with coloured cells ; favellæ small, subterminal, subtended by
three or four involucral ramuli.
Cebamium fastigiatum, Harv. in Hook. Land. Journ. Bot. vol. i. p. 303.
Wyatt, Alg. Banm. no. 86. Harv. Man. 1st ed. p. 99.
G o n g b o c e k a s fastigiatum. Kg. in Linn. xv. p. 736. Bliyc. Gen.
H ab. On rocks, &c., near low-water mark ; rare. Annual. Autumn and
winter. Torquay, Mrs. Griffiths. Mt. Batten, Plymouth, Bev. W.
S. Hore. Frith of Forth, Hr. Greville.
G b o g r. D is tb . Mediterranean Sea, Kiitzing. East coast of North America.
D e sck . Filaments 4 -5 inches high, as thick as human hair, densely tufted, of
equal diameter throughout, fastigiate, many times dichotomous, regularly
forking from the base to the apex, mostly bare of lateral branchlets, but
sometimes having a few, short, simple or forked ramuli. The lower axils
distant, and somewhat spreading ; the upper close together and narrow,
acute. Apices generally emarginate, the points straight, or slightly curved,
somewhat hooked, but not roUed inwards. Lower articulations from three
to six times as long as broad, pellucid and ooloui-less, furnished occasionally
with a few scattered granules ; upper articulations gradually shorter, the
pellucid spaces suffused ivith pale, watery endochrome ; the uppermost very
short and strongly coloured. Favellce of small size, sessile near the apex
ot the frond, having a few short, involucral ramuli. Tetraspores I have not
seen. Substance tender, and flaccid, closely adhering to paper. Colour, in
the tuft, a dark purple, fading in the herbaiium to brick-dust colour ; in the
filament, a clear purplish lake.
This is one of the rarest and most beautiful of the British
species of Ceramium. It is nearly related to G. nodosum, particularly
in ramification, and in the diameter of its filaments ; but
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