Caulerpa verticillata

Thallus fine, fibrous, light green or dark green tufts, 1–3(–10) cm high, consisting of creeping, abundantly branched stolons bearing erect verticillate branch axes and discending rhizoid-bearing branches. Stolons slender, 300–600 μm diam. Delicate worls on erect axes arranged at regular intervals and composed of repeatedly dichotomous (5–7 times) branchlets gradually tapering toward pointed apices. Basal segments of branchlets 100–210 μm diam., 5–10 diameters long, apical segments forked, 30–40 μm diam. The branchlets are not constricted at dichotomies. Growing on hard substrate, dead coral blocks in the intertidal and subtidal zones (to 30 m deep).

Tropics and subtropics of Atlantic, Indian and Pacific Oceans. Common in countries of the Asia-Pacific Region: China, Japan, Vietnam, Thailand, Malaysia, Singapore, Indonesia, Philippines, Australia and New Zealand, Pacific Islands.