Sargassum heterocystum Montagne, 1842b: 250 (type locality: "In mari chinensi Cochinchinam'' [Vietnam]).—Reinbold, 1907: 562.— Reinbold in Weber-van Bosse, 1913a: 170–171.— Islam, 1974b: 87.— Islam, 1976: 47, pl. 32: figs. 210a,b.
INDIAN OCEAN DISTRIBUTION: Bangladesh, Indonesia (Sumatra and Timor).