Gracilaria dura (C. Agardh) J. Agardh var. fruticosa J. Agardh, 1852 [1851–1863]: 589–590 (type locality: "ad Indiam orientalem'' ["Hindostan'' i.e. India fide G. Martens, 1868: 94]).
Sphaerococcus densus C. Agardh var. fruticosus (J. Agardh) G. Martens, 1868: 94–95.
Gracilaria incrustata J. Agardh, 1901: 62–64.—De Toni, 1924: 256.
INDIAN OCEAN DISTRIBUTION: India.
Note: When establishing Gracilaria dura var. fruticosa, J. Agardh cited "Gigartina fruticosa Grev. mscr.'', and when elevating this variety to the level of species, he cited "Gr. fruticosa Grev. mscr. in Hb. Hooker''. These manuscript names have nothing to do with Gracilaria fruticosa Harvey (q.v.), but the prior existence of the latter name required J. Agardh to change the epithet at the level of species.