Ceramium pulvinatum Mertens in Jürgens, 1817: fasc. 4: no. 5 (`pluvinatum') (type locality: "in Dynastia Jeverensi'' [Oldenburg, Germany]).
Calothrix pulvinata (Mertens) C. Agardh, 1824: 71.—Prain, 1892: 342, 359.— Prain, 1893: 83.— Khan & P. Anand, 1944: 61.— Venkataraman, 1958: 473.— Farghaly, 1980: 147.— G. Subramanian et al., 1989: 311, 317.— Thajuddin & G. Subramanian, 1992a: table III.
INDIAN OCEAN DISTRIBUTION: Andaman Islands, Burma (Coco Group), India, Madagascar.
Note: Drouet (1973: 165, 184), after examining the holotype of this species (in BREM), assigned it to Calothrix crustacea Thuret.