Caulerpa pinnata C. Agardh forma laxior Weber-van Bosse, 1898: 291 (syntype localities: Burmuda; "Indes Orientales'').
Caulerpa mexicana Sonder ex Kützing forma laxior (Weber-van Bosse) W.R. Taylor, 1960: 141.—Farghaly, 1980: 86–87, pl. IX: fig. 3 (as var. laxior, but combination not validly published).
INDIAN OCEAN DISTRIBUTION: Madagascar.