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PLcelLapk. 2.THALASSIOPHYTiE. 29.Callith. 325
1. Callith. purpurascens. Purplish pretty-iveed.
Threads thrice pinnately divided, very slender, membranaceous,
purplish red ; branches and twigs spreading; knots
contracted; joints 3 times as long as broad.
Conferva inarina nodosa, coralloidis montani instar ramosa, JOiUen
Jltisc, 36,
Conferva purpurascens, Huds. Fl. Angl. 600 ; Engl. Bot. 2469.
Cooferva rosea, DiUicyn Conf. 17.
Ceramium roseura, Roth Cat. 2, 182,
Callithamnion roseum, Lyngbye Hydr, Dan, 126.
Sea-shore, on stones or marine plants.
Thallus tufted, 2 or 3 inches long ; branches many, alternate;
twigs very numerous; capsules on the upper side of
the twigs.
&. rosea. Tuft closer, rose red.
Conferva rosea, Engl. Bot. 966.
2. Callithamnion corymbosum. Corymbus pretty-weed.
Thallus branched like network, corymbose, slender,
tufted, rose-colour; branches alternate, many-cut, in bundles;
apex 2-cut; joints slightly dilated above, about twice
as long as broad ; knots pellucid ; thecce ovate, scattered,
peduncled ; peduncles very short.
Conferva corymbosa, Engl. Bot. 2352,
Ceramium pedicellatum, Fl. Dan. 1596,
Callithamnion corymbosum, Lynghye Hydr, Dan. 125.
Sea-shores,
Thallus outline round.
8. Callithamnion Borreri. Borrer's pretty-'Weed.
Thallus repeatedly branched, hairlike, bright red;
branches all alternate, spreading in 2 directions, zigzag,
level-topped; joints cylindrical, about twice as long aa
broad.
Conferva Borreri, Engl. Bot. 1741.
Sea-shore; October.
Thallus tufted, about 2 inches high, becomes orangeyellow
by weathering, very slender; tivigs corymbose ; iwo/s
slightly contracted.
4. Callith. thujoides. Arbor-vitcB pretty-weed,
Thallus repeatedly branched, A'^ery slender, tufted
branches alternate, zizgag ; side-shoots alternate, compound;
joints very short, cylindrical.
Conferva thujoides, Ep§?.J3of. 2205.
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