Calothrix fuscoviolacea P. Crouan & H. Crouan, 1859b: 291, pl. 22: fig. H (`fusco-violacea') (type locality: Brest, Finistère, France).—Jadin, 1894: CLXXII.— Forti, 1907: 608.— Geitler, 1931 [1930–1932]: 599.
INDIAN OCEAN DISTRIBUTION: Mauritius.
Note: Drouet (1973: 173, 186), after examining the holotype of this species (in CO), assigned it to Calothrix crustacea Thuret.