Callithamnion divergens J. Agardh, 1876: 19 (type locality: Tasmania).
Antithamnion divergens (J. Agardh) J. Agardh, 1896: Index p. 1.—Wollaston, 1968: 281–284, fig. 15.— R. Norris, 1987c: 27–29, figs. 16–18.— Huisman et al., 1990: 96.— Kendrick, Huisman, & Walker, 1990: 51.
INDIAN OCEAN DISTRIBUTION: Australia, South Africa.
Note: Athanasiadis, Garbary, & Vandermeulen (1990: 563) expressed the possibility that the Norris record from South Africa is representative of Antithamnion makroklonion Athanasiadis, Garbary, & Vandermeulen (1990: 557–563, figs. 1–8, 9A–C; type locality: Elat, Israel).