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Green marine subtidal alga, epilithic or in sand, to 15 cm tall; base stoloniferous, terete, naked, to 1 mm diam.; upright fronds to 8 mm broad, terete below, compressed above; lateral ramuli opposite-distichous, to 3 mm long, curved, with a broad tip.
Habit and structure. Stolon slender, 0.5–1 mm in diameter, naked, epilithic or in sand. Erect fronds medium to dark green, simple to several times branched, usually 4–15 cm high and 3–4(–8) mm broad, terete below with the axis becoming compressed above and 0.5–1 mm broad, bearing opposite, distichously arranged (rarely with odd non-distichous ramuli), closely adjacent ramuli. Ramuli slightly compressed, 1–2(–3) mm long, slightly upwardly curved and broadest (0.2–0.5 mm) just above the slightly constricted base, tapering in their upper quarter to one third to a broad point.
Distribution. From Seven Mile Beach, Dongara, to King George Sound, W. Aust.
Habitat. C. distichophylla is relatively common on the west coast of W. Aust., in subtidal rock pools and to 6 m deep, but apparently rare on the south coast.
[After Womersley, Mar. Benthic Fl. Southern Australia I: 258 (1984)]