* Sargassum cymosum C. Agardh var. scabriusculum Grunow
Sargassum cymosum C. Agardh var. scabriusculum Grunow, 1916 [1915–1916]: 142 (`scabriuscula') (syntype localities: near Rio de Janeiro, Brazil; South Africa: Cape of Good Hope; Algoa Bay; "Caffraria'').