Fucus cactoides Turner, 1809–1811: 89–90, pl. 171 (type locality: "southern coast of New Holland'').
Caulerpa cactoides (Turner) C. Agardh, 1817: XXIII.—Harvey, 1858b: pl. XXVI.— Harvey, 1863: lvi.— J. Agardh, 1873: 44–45.— De Toni, 1889: 485–486.— Weber-van Bosse, 1898: 390–391.— Womersley, 1956: 365–366.— Islam, 1976: 18, pl. 12: figs. 94, 95; pl. 14: fig. 103.— Womersley, 1984: 269–270.— Edgar, 1990: 3.— Huisman & Walker, 1990: 364.— Coppejans & Prud'homme van Reine, 1992a: 172.
Taxonomic synonym:
* Caulerpa cactoides (Turner) C. Agardh var. gracilis G. Murray, 1891: 211, pl. LII: fig. 8 (type locality: Western Australia).
Misapplied name (fide Womersley, 1956: 365):
Caulerpa corynephora.—Harvey, 1855b: 564.
INDIAN OCEAN DISTRIBUTION: Australia, Bangladesh, Indonesia (Sumba).
Note: Womersley (1956: 366) expressed the opinion that var. gracilis does not warrant varietal rank.