ñ a u c e u x .
ri,ífo: ’■
1 P l a t e CCXXX.
CALLITHAMNION ROSEUM, Lyngh.
G b n . C h a r . Froncl rosy, or brownisli-red, filamentous; stem either opake
and cellular, or translucent and jo in ted ; branches jointed, one-tubed,
mostly pinnate (rarely dichotomous or irre g u la r); dissepiments hyaline.
F ru it of two kinds on distinct p la n ts ; 1, external tetraspores,
scattered along th e ultimate branchlets, or borne on little pedicels;
2, roundish or lobed, berry-like receptacles {fa v e lla ), seated on the
main branches, and containing numerous, angular spores. Ca l l i t
h a m n io n {Lyn g h ),— from koXos, heautiful, and Bagviov, a little shrub.
C a l l it h a m n io n roseum; stems much and loosely b ranched; secondary
branches long, flexuous, suhdistiohously plumulate ; plumules lax,
with a roundish outline, crowded towards th e tops of the branches,
simply pinnate ; pinnæ long, spreading, curved ; articulations of the
stem and branches four and five times as long as broad, more or less
filled with veins; those of th e pinnæ twice or thrice as long as
broad ; tetraspores elliptical, four or five on each pinna, from the
lower joints ; favellæ tufted.
Ca l l it h a m n io n roseum, Lyngl. Hyd. Ban. p. 126. t. 39 (?). Ag. Sp. Alg.
vol. ii. p. 164. Harv. in Hook. Br. M. vol. ii. p. 341. Harv. in Mac.Fl.
JÏÏ5. part 3. p. 214. Harv. Man.-p.\99. Wyatt, Alg. Banm.-aa. 44. Endl.
3rd Suppl. p. 34.
P h l e b o t h a m n iu m roseum, Kiitz. Phyc. Gen. p. 875. t. 44. f. 1.
Ce r a m iu m roseum, Both, Cat. Bot. vol. iii. p. 145. Ag. Syst. p. 139.
Co n fe r v a rosea, E. Bot. t. 966. Billto. t. 17 (??).
H a b . On rocks and th e larger A c i , near low-water m a rk ; frequently iu
æstuaries, or muddy places. Annual. Summer. N o t uncommon.
G e o g r . D i s t e . Atlantic shores of Europe.
D e s c r . Fronds densely tufted, three or four inches long. Stems as thick as hog’s
bristle at the base, in young plants pellucid, but in old, opake and full of
veins, or internal fibres, excessively branched and bushy ; the branches
alternate, repeatedly divided. Lesser branches somewhat virgate, set
throughout their length, at nearly every joint, with alternate simply pinnated
plumules, of roundish or ovate outline. Pinna long, more or less incurved,
either quite simple, or furnished with one or two small pinnulæ near the
apex. Articulations of the stem and branches four- or five times as long as
broad, or more, somewhat swollen at the joints ; those of the lesser branches
and ramuli gradually shorter. Endochrome nearly filling the tube. Tetraspores
elliptical, sessile on the inner faces of the pinnæ, one at each of the four
or five lowermost joints. Eaveïlæ generaUy terminating truncated branches,
two or more together : sometimes several united in a berry-like mass.
Colour in young specimens a fine purple-lake, in old brownish, becoming
brighter in fresh-water. Suhstance membranaceous and soft, closely adhering
to paper, but not gelatinous.