Note: Gardnerula De Toni fil. (1936b: [5]) is a substitute name for Polythrix Zanardini (1872: 160), a later homonym of Polythrix Nees 1847 in the Acanthaceae.
Microcoleus corymbosus Harvey, 1858a: 109, pl. XLVIII.B (type locality: Key West, Florida, U.S.A.).
Polythrix corymbosa (Harvey) Grunow ex Bornet & Flahault, 1886a [1886–1888]: 380 (including Indian Ocean record).—Forti, 1907: 645–646.
Gardnerula corymbosa (Harvey) De Toni fil., 1936b: [5].—Golubic, 1976: 120–121, fig. 1d.— Golubic, 1982: 279.
INDIAN OCEAN DISTRIBUTION: Australia, Persian Gulf.
Note: Drouet (1973: 173, 189), after examining the holotype of this species (in TCD), assigned it to Calothrix crustacea Thuret.