Laurencia decumbens Kützing, 1863b: 18 (type locality: New Caledonia).—Børgesen, 1945: 50–53, figs. 25–27.— Børgesen, 1952: 65.— Børgesen, 1954a: 46.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 21 (table 1).— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 44.— Wynne, 1995: 308–310, figs. 61, 62, 64, 65.
Taxonomic synonym:
* Laurencia pygmaea Weber-van Bosse, 1913b: 122, pl. 12: fig. 6 (type locality: Diego Garcia Atoll).—Weber-van Bosse, 1914: 286, pl. 16: fig. 6.— Weber-van Bosse, 1923: 344–345.— De Toni, 1924: 372–373.— Yamada, 1931b: 201–202.— Jaasund, 1970a: 63.— Rhyne, 1971: 61.— Jaasund, 1976: 141, fig. 285.— Lawson, 1980: 54.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 21 (table 1).— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 44.
Misapplied name (fide Børgesen, 1945: 50–53):
Laurencia perforata.—Jadin, 1935: 168.
INDIAN OCEAN DISTRIBUTION: Aldabra Islands, Diego Garcia Atoll, Indonesia (Java), Mauritius, Réunion, Seychelles (including Mahé Island), Tanzania.
Note: Wynne (1995: 308), following the suggestion of Jaasund (1970a: 63), placed Laurencia pygmaea in synonymy with L. decumbens.