Gigartina speciosa Sonder, 1845: 55 (type locality: Western Australia).—Kützing, 1849: 751.
Eucheuma speciosum (Sonder) J. Agardh, 1852 [1851–1863]: 628–629.—Harvey, 1855b: 551.— Harvey, 1859a: pl. LXIV.— Harvey, 1863: xxxvii.— J. Agardh, 1876: 603.— Sonder, 1880: 28.— J. Agardh, 1892: 126.— De Toni, 1897: 375.— Lucas, 1909: 28.— De Toni & Forti, 1923: 22.— Weber-van Bosse, 1928: 412.— Jadin, 1935: 164.— V. May, 1965: 388.— Pichon, 1978: 162, 165, 249, 303, 413.— Doty & J. Norris, 1985: 49.— Doty, 1988: 195–197, figs. 1, 3A, 24D, 29–31.— Kendrick, Walker, & McComb, 1988: table 1.— Woelkerling, 1988: fig. 120 (identified only to genus).— Huisman et al., 1990: 95.— Huisman & Walker, 1990: 404–405.— Kendrick, Huisman, & Walker, 1990: 48, 51.— Huisman, 1993: 14.
Betaphycus speciosum (Sonder) Doty.
Gigartina ornata Sonder ex Kützing, 1868: 3, pl. 6: figs. c, d, nom. illeg.
INDIAN OCEAN DISTRIBUTION: Australia, Madagascar, Mauritius, Réunion.
Note: The first use of this binomial (by Doty (1995: 243) was invalid since the generic name had not yet been validly published (see Art. 43.1). Gigartina ornata is a superfluous substitute name for Gigartina speciosa.