Thysanocladia (?) hildebrandtii Hauck, 1886 [1886–1889]: 217–218 (type locality: Mombasa, Kenya).
Gelidium hildebrandtii (Hauck) Schmitz, 1894b: 196–197.—Schmitz, 1895a: 139.— Schmitz, 1895b: 27.— De Toni, 1897: 157–158.— Farghaly, 1980: 160.— Lawson, 1980: 46.
Beckerella hildebrandtii (Hauck) Kylin, 1956: 139.—Akatsuka, 1987: 260, 269, figs. 7, 13, tables I, II.
Ptilophora hildebrandtii (Hauck) R. Norris, 1990a: 133, figs. 1–3 (`hildebrantii').—R. Norris, 1992d: 26, fig. 14.
INDIAN OCEAN DISTRIBUTION: Kenya, Madagascar, South Africa.