Sargassum myriocystum J. Agardh, 1848b: 314 (syntype localities: "in mari chinensi''; Jakarta, Java, Indonesia; "ad oras Hindostaniae'' [India]).—Kützing, 1849: 619–620.— G. Martens, 1868: 27, 76–77.— Dickie, 1874b: 190.— J. Agardh, 1889: 99.— Möbius, 1893: 137.— De Toni, 1895b: 70–71.— De Wildeman, 1897a: 158.— De Wildeman, 1900: 381–382.— Reinbold, 1907: 561.— Grunow, 1915 [1915–1916]: 440.— Børgesen, 1933a: 14–15.— Børgesen, 1941: 68.— Biswas & Sharma, 1950: 91–92.— Chacko, Mahadevan, & R. Ganesan, 1955: 12 (`myriophyllum').— Krishna Pillai, 1957c: 70.— Varma, 1959: 249.— Varma, 1961: 225.— Thivy, 1964: 27.— S. Dixit, 1966: 10.— Misra, 1966b: 181, fig. 97.— K. Srinivasan, 1967: 146, fig. 34.— Umamaheswara Rao, 1967: 126 (`moriocystum').— H. Burkill, Greenwood-Barton, & Crowther, 1968: 433, tables III–V.— Umamaheswara Rao, 1969d: 42.— V. Krishnamurthy & H. Joshi, 1970: 14.— Umamaheswara Rao, 1970a: 4.— K. Pillay, 1977a: 53.— Umamaheswara Rao, 1978: 53.— Nair & Thampy, 1980: 279.— Kalimuthu, 1981: 265–266, fig. 1.— Chandrasekhara Rao et al., 1982: tables 2, 3.— Chennubhotla et al., 1982: 195–196, figs. 1, 2.— Gopinathan & Panigrahy, 1983: 25.— Teo & Wee, 1983: 78, fig. 81.— Untawale, Dhargalkar, & Agadi, 1983: [23].— R. Parekh et al., 1984: table 1.— Padmini Sreenivasa Rao, Sreenivasa Rao, & Karmarkar, 1986b: 25, 27.— Chennubhotla, Kaliaperumal, & Kalimuthu, 1987a: 104–105, fig. 7C.— R. Parekh & Chauhan, 1987: table 1.— Silas & Kalimuthu, 1987: 56.— Umamaheswara Rao, 1987a: 22.— Padmini Sreenivasa Rao, Sreenivasa Rao, & Karmarkar, 1988a: 295.— Pant & Untawale, 1989: table 5.— Kaliaperumal, Kalimuthu, & Ramalingam, 1990: table 2.— Kamat et al., 1991: 55.— Kesava Rao & Untawale, 1991: 100.— Phang & Wee, 1991: 61.— D. Rao et al., 1991: tables 1, 2.— Kalimuthu, Kaliaperumal, & Ramalingam, 1992: 122.— Kamat et al., 1992: table I.— Jayasankar & Ramalingam, 1993: 42.— Kaliaperumal & Kalimuthu, 1993: 9, 11, fig. 11.
Taxonomic synonym:
Sargassum opacum J. Agardh, 1889: 98–99, pl. XXVIII: figs. 13–17 (type locality: "ad oras calidiores Novae Hollandiae'' [tropical Australia]).—Reinbold in Weber-van Bosse, 1913a: 167.
INDIAN OCEAN DISTRIBUTION: Andaman Islands, India, Indonesia; Malaysia, Mauritius, Nicobar Islands, Seychelles (Mahé Island), Singapore, Sri Lanka.
Note: The synonymy was proposed by Ajisaka, Noro, & Yoshida (1995: 30).