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P l a t e CCXV.
C E R A M I U M B O T R Y O C A R P U M , Oriff.
G e n . C h a r . Frond iUiform, one-tubed, articulated; tbe dissepiments
coated witb a stratum of coloured cellules, which sometimes extend
over the surface of the articulation. Fructification of two kinds, on
distinct individuals ; 1, tetraspores either immersed in the ramuli, or
more or less external; 2, sessile, roundish receptacles {faveUæ),
having a pellucid limbus, containing minute, angular spores, and
subtended by one or more short, involucral ramuli. C e ram ium
{Both.),—from Kcpagos, a pitcher, but the fruit is not pitcher-shaped.
C e r am ium hotryocarpum ; filaments crooked at tbe base, robust, graduaUy
attenuated upwards, irregularly dichotomous, witb numerous lateral,
mostly simple ramuli, tbe apices straight; articulations coated with
coloured oeUules, unarmed, the lowermost twice as long as broad, the
upper shorter than their breadth; dissepiments constricted; tetraspores
immersed in the articulations, whorled; favellæ globose, of
small size, heaped together in irregular clusters, borne on the lateral
branchlets, destitute of involucral ramuU.
Ceramium hotryocarpum, Griff, in Herb.—Harv. Phyc. Gen. in list of species,
vol. i. pi. xi.
H a b . On rooks and Algæ, between tide-marks. Annual. Summer.
Discovered on Preston rocks, Torquay, by Miss Amelia F . Grifiiths,
(1844.) Ardrossan, Bev. D. Landsborough.
Geogr. D is t r . Britisli Islands.
D e sc r . Root scutate, with imperfect fibres. Stems sharply hooked or cmwed at
the base (not well shown in figure), thicker than hogs’ bristles, gradually
attenuated upwards, three to five inches long, several times branched in a
more or less regular dichotomous manner, the branches erect, with sharp
and narrow axiUæ, the apices sometimes level-topped, sometimes of unequal
length, straight, not hooked inwards. The stem and main branches are
very generally clothed with short, densely and irregulary inserted, simple
or rarely forked, subulate or fusiform ramuli, two or three lines in length,
and tapering to both extremities, much more slender than the parts from
which they spring, but otherwise of similai- structure. Articulations
coated with a stratum of minute, coloured cells, those of the lower part of
the stem twice as long as broad, those of the upper about equalling their
breadth; dissepiments opake, constricted. Pructifivation \ 1, tetraspores
dark pur lie, several in the same joint, arranged transversely, immersed,
very sligitly prominent. 2,favellce small, round, heaped together like
clusters of grapes, irregularly placed on the sides of the lateral ramuli,
destitute of involucre. These are commonly produced in great profusion ;
but I have occasionally observed solitary favellæ, furnished with an invo-
VOL. I I . 3 A