Fucus flavus Linnaeus fil., 1782: 452 (type locality: Sri Lanka).
Thaumasia flava (Linnaeus fil.) C. Agardh, 1824: 196.
INDIAN OCEAN DISTRIBUTION: Sri Lanka.
Note: This organism is not an alga. G. Martens (1868: 42) thought that it might be a sponge, Spongia aculeata Linnaeus (Spongiidae).