Halimeda gracilis Harvey ex J. Agardh, 1887: 82 (type locality: Sri Lanka).—G. Murray, 1887: 39.— De Toni, 1889: 521.— Barton, 1901: 22–24, pl. III: figs. 28, 30–32 ("var. typica'').— Barton, 1903b: 164, 165–167, figs. 1–3.— Herdman, 1903: 90.— E. Gepp, 1904: 193–195, pl. 461: figs. 1–3.— A. Gepp & E. Gepp, 1908: 181 ("var. typica'').— A. Gepp & E. Gepp, 1909: 391 ("var. typica'').— Børgesen, 1936: 71.— Hillis, 1959: 356–357, pl. 2: fig. 4; pl. 5: fig. 7; pl. 6: fig. 9; pl. 7: fig. 2; pl. 10.— Durairatnam, 1961a: 24–25.— W.R. Taylor, 1966a: 353.— S. Dixit, 1968: 16.— V. Krishnamurthy & H. Joshi, 1970: 7.— Subbaramaiah, Nair, & V. Krishnamurthy, 1977: 74.— M. Joseph, 1978a: 17.— Hillis-Colinvaux, 1980: 144–147, figs. 44a,b.— Untawale, Dhargalkar, & Agadi, 1983: [14].— Aleem, 1984: 923.— Jagtap & Untawale, 1984: 123, tables 1, 2.— Untawale & Jagtap, 1984: 100 (table 1).— Jagtap, 1985a: 46, 50.— Jagtap, 1987: table 1.— Hillis-Colinvaux, 1988: 16 (table 1).— Untawale & Jagtap, 1989: table I.— Untawale, Reddy, & Ambiye, 1989: table 1.— Coppejans & Verellen, 1991: 16.— D. Rao et al., 1991: tables 1, 2.— Thomas & Subbaramaiah, 1991a: 202, table 2.— Bhakuni et al., 1992: 515.— Kalimuthu, Kaliaperumal, & Ramalingam, 1992: 122.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 24 (table 1).— Odintsov, 1992: table 1.— Titlyanov et al., 1992: 17, 22 (tables 1, 2).— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 45.— Jayasankar & Ramalingam, 1993: 42.— Kerkar, 1994: table 1.— Titlyanov et al., 1994: 259.— E. Drew, 1995: 144.
Misapplied name (fide V. Krishnamurthy & H. Joshi, 1970: 7, 8):
Halimeda cuneata.—K. Srinivasan, 1961a: 229.
INDIAN OCEAN DISTRIBUTION: Aldabra Islands, Amirante Islands, Andaman Islands, Chagos Archipelago, Comoro Islands, India, Indonesia (Mentawai Islands), Kenya, Laccadive Islands, Nicobar Islands, Saya de Malha Bank, Seychelles, Singapore, Sri Lanka.
Note: This species was distributed by Harvey (1857a: no. 72) in his Ceylon exsiccata under the name Halimeda gracilis, without a description.