Caulerpa taxifolia

Thallus bright dark- or grass-green consists of widely spreading stolons bearing erect branches above and rhizoids below. Branches closely placed to each other, flattened, 2-3(-15) cm high, 6-8(-12) mm broad, stalked, naked near base feather-like, linear-oblong to linear with slightly compressed midrib (oval in transverse section, 1.0-1.5 mm broad. New branches often proliferating from midrib. Pinnules flattened, regularly opposite, upcurved, sickle-shaped towards apices, slightly constricted at base, 0.3-0.5(-1) mm wide, (1.7)-2.5-6 mm long, tapering at tips and base. Apices pointed. Creeping stolons dark green, (1)-1.5-2.5 mm diam. bear descending delicate rhizoids. Rhizoids stalked, repeatedly branching to slender apices. Growing on hard substrate covered with sand and on sandy bottom.

Subtropical and tropical waters.