Fucus flaccidus Turner, 1807–1808: 137–138, pl. 61, nom. illeg. (type locality: Cape of Good Hope, South Africa).
Delesseria flaccida Lamouroux, 1813: 125.
Ptilota flaccida (Lamouroux) C. Agardh, 1822 [1822–1823]: 388.—Krauss, 1846: 212.
Carpoblepharis flaccida (Lamouroux) Kützing, 1849: 690.—Barton, 1893: 114.— Stegenga & Bolton, 1992: fig. 3, table I.
INDIAN OCEAN DISTRIBUTION: South Africa.
Note: Fucus flaccidus Turner, the intended basionym of Carpoblepharis flaccida, is not priorable since it is a later homonym of F. flaccidus Lamouroux (in De Candolle, 1802: 131, pl. IX: fig. 1; type locality: near Barcelona, Spain), a name of uncertain application, and F. flaccidus Labillardière (1806–1807: 113, pl. 259: fig. 2), which was placed by J. Agardh (1873: 61–62) in the synonymy of Sargassum verruculosum (Mertens) C. Agardh (q.v.). Delesseria flaccida Lamouroux is treated as a nomen novum in accordance with Art. 58.3.