Sargassum cinereum J. Agardh var.? thunbergii Grunow, 1915 [1915–1916]: 378 (syntype localities: Coromandel Coast, India; Natuna Islands, Indonesia; Sri Lanka).—K. Srinivasan, 1965: 243.— K. Srinivasan, 1967: 137, fig. 22.— V. Krishnamurthy & H. Joshi, 1970: 14.
INDIAN OCEAN DISTRIBUTION: India, Sri Lanka.