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:324 29. Callith. g.THALASSIOPHYT^. Pl.cell.aph.
Sea-coast; September, October.
Thallus tufted, 1 or 2 inches long; joints of the stem
to 6 times as long as broad, of the twigs only as long.
5. Callith. tetragoniim. Four-sided pretty-weed,
Thallus much-branched, red; twigs bundled, short,
spreading horizontally attenuated at bottom, pointed at
the tip ; joints ovate-cylindrical, twice as long as broad.
Conferva tetragona, Withering Bot. 4,405; Engl. But. 1690.
Sea-shore, or parasitical on other sea-plants.
Thallus tufted, 2 or 3 inches long; branches "i-sided,
sides hollowed ; joints of the twigs about as long as broad
theccp. globular.
6. Callithamnion tetricum. Dirty pretty-weed.
Thallus several times pinnated, brown red, lurid ; segments
and lobes alternate ; points rather curved ; joints
about 3 times as long as broad ; theccR single, slightly pe-
dicelled.
Conferva tetrica, Dillwyn Conf. 81 ;
Engl. Bot. 1915.
Sea-shore, on stones and marine plants.
Stems many, tufted, 6 or 8 inches high, alternatelj
doubly pinnate ; twigs pinnate ; joints equal.
7. Callithamnion Hookeri. Hooker s pretty-weed.
Thallus very much branched; stem thick, not visibly
jointed, pale reddish- brown ; twigs crowded, short, pinnate
; lobes alternate, jointed ; joints rather longer than
broad.
Conferva Hookeri, Dillw. Conf. 106.
Sea-shore.
8. Callithamnio7i floccosum. Flock prelty-weec
Thallus branched, rose-colour ; branches alternately pin-^
nated ; segments opposite, pectinated, horizontally recurved]
lobes pointing one way ; joints about 3 times as long ai
broad.
Conferva Turneri, Engl Bot. 1637.
Conferva Plumula, Ellis Ph. Tr. 57, 425 ; Dillw. Conf. 50.
Conferva floccosa, Fl. Dan. 828.
Ceramiutn floccosum. Roth Cat. 2, 185.
Ceramium Plumula, Jtgardh Syn. 62,
Sea-shore ; May to July.
Thecce sessile, globular, on the lobes.