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P l a t e CXCIII.
CERAMIUM DIAPHANUM, Both.
G e n . Ch a e . Frond filiform, one-tubed, articulated ; the ¿fesepiments coated
with a stratum of coloured cellules, which sometimes extend over the
surface of the articulation. Fructijication of two kinds on distinct
individuals ; 1, tetraspores either immersed in the ramuli or more or
less external; 3, sessile, roundish receptacles (favellce), having a
peUuoid limbus, containing minute, angular spores, and subtended
by one or more, short, involucral ramuh. Ceeam ium (Roth.),—
from Kepagos, a pitcher ; but the fruit is not pitcher-shaped.
Ceeamium diaphanum-, filaments setaceous, attenuated upwards, rather
llacoid, irregularly dichotomous, the lower forkings distant, the upper
close together ; branches set with short, lateral, dichotomous ramuli ;
articulations colourless, those of the main stems three or four times
as long as broad, of the ramuli short ; dissepiments swollen, opake ;
apices hooked inwards ; tetraspores whorled iu the joints, depressed ;
favellæ in the ultimate forkings of the branches, or on lateral ramuli,
involúcrate.
Ceeamium diaphanum, Bath, Cat. Boi. vol. iii. p. 154. Ag. Syn. p. 61.
Hook. Fl. Scot. part 3. p. 85. Ag. Syst. p. 133. Ag. Sp. Alg. vol. ii. p. 150.
Grew. Fl. Fdin. p. 310. Harv. in Hook. Br. Fl. vol. ii. p. 336. Wyatt,
Alg. Banm. no. 87. Harv. in Mack. Fl. Hib. part 3. p. 310. Harv. Man.
p. 99. J. Ag. Alg. Medit. p. 81. Fndl. 3rd Swppl. p. 37.
H oemooeeas diaphanum. Kg. Phyc. Oen. p. 378. Kg. Innn. xv. p. 733.
Conpeeva diaphana, Inghtj. Fl. Soot. p. 996. Fl. Ban. t. 951. Both. Fl.
Germ. p. 535, and Cat. vol. ii. p. 336. Billw. Conj, t. 38. F. Bot. t. 1742,
Wilh. vol, iv. p, 139.
Conpeeva nodulosa, Huds. Fl. Ang. p. 600.
B oryna diaphana, Grat. Bict. Class, t. 11. Bory, Morìe, p. 77. no. 1797.
I Ia b . Parasitical on several of the smaller Algæ in rook-basins, between
tide marks ; sometimes growing on rocks. Annual. Summer. Not
uncommon on the British coasts from Orkney to Cornwall.
Geoge. D is t e . Dispersed throughout the temperate parts of the Atlantic and
Pacific Oceans. (The various localities given require re-examination, as several
species are commonly confounded by authors under the name diaphanum)
Mediterranean and Black Seas, Ag.
De sc e . Baot minute, discoid. Fronds, three to six or eight inches long, not very
densely tufted, setaceous at base, gradually attenuated upwards to a capillary
fineness, more or less regularly dichotomous, or flabellately branched,
sometimes alternately divided with an evident main-stcm ; the branches
naked, or set with slender, forked, or several times dichotomous, short
ramuli, one to three lines in length. Apices hooked in. Lower axils ilis-
taut, spreading ; upper gradually closer and more erect. Articulations