Ser. RHODOSPERME®. Fam. Ceramiea. 
Priate CCCXIV. 
CALLITHAMNION DAVIESII, Zyngo. 
a 
Gun. Cuar. Frond rosy or brownish-red, filamentous ; stem either opake 
and cellular, or translucent and jointed ; branches jointed, one-tubed, 
mostly pinnate (rarely dichotomous or irregular) ; dissepiments hya- 
line. Fruit of two kinds, on distinct plants: 1, external ¢etraspores, 
scattered along the ultimate branchlets, or borne on little pedicels ; 
2, roundish or lobed, berry-like receptacles (favel/e) seated on the 
main branches, and containing numerous angular spores. CALui- 
THAMNION (Lyngh.),—from xadXdos, Leauty, and Gaynor, a little shrub. 
CaLLITHAMNION Daviesii; rose-red, minute, tufted, much branched; 
branches curved, scattered, patent; ramuli of several cells, fascicled, 
or crowded toward the axils of the secondary branches ; tetraspores 
pedicellate, borne on the axillary ramuli. 
CALLITHAMNION Daviesii, Lyngb. Hyd. Dan. p.129.t.41. 4g. Sp. Alg. vol. 
il. p.186. Harv. in Hook. Brit. Fl. vol. ii. p. 348. Harv. Man. ed. 1. 
p- 117. ed. 2. p. 184. (im part). Kiitz. Spec. Aig. p. 638. (in part). 
TRENTEPOHLIA Daviesii, Harv. in Mack. Fl. Hid. part 3. p. 219. 
ConFerva Daviesii, Dillw. Conf.t.F. E. Bot. t. 2329. 
Has. Parasitical on Ceramiwm rubrum and other small Alge, in pools 
between tide-marks. Annual. Summer and Autumn. Anglesea, 
Rev. H. Davies. Bantry, Miss Hutchins. Torquay, Mrs. Griffiths. 
Brighton, Mr. Borrer; and perhaps generally distributed round our 
shores. . 
Geroer. Distr. Atlantic Shores of Europe. North America. 
Descr. Filaments two to four lines high, forming small, pencil-like tufts, or 
spreading continuously, sometimes but slightly divided, sometimes much 
branched, the branches in one or two series, curved, spreading. Primary 
branches elongated, destitute of ramuli, but bearing usually, at considerable 
intervals, two or more rather short, secondary branches, which are either 
alternate or secund, and are furnished near their base, almost at the axil, © 
with several secund closely-placed ramuli. Ramuli of several cells, either 
simple or slightly branched, rarely scattered. Zetraspores pedicellate, 
borne on the supra-axillary ramuli, elliptical. Colour a fine rosy red. Sud- 
stance membranaceous and delicate. In drying, the plant adheres closely 
to paper. 
Under the last plate I have stated the close affinity which con- 
nects this species with the Cal. virgatulum, there figured. Both 
y 2 
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