Fucus pinnatus Linnaeus fil., 1782: 452, nom. illeg. (type locality: "in Zeylona in Freto Chilas'' [Chilaw, western Sri Lanka]).—Turner, 1807–1808: 117–119, pl. 53.
Caulerpa pinnata C. Agardh, 1817: XXII.
INDIAN OCEAN DISTRIBUTION: Sri Lanka.
Note: Fucus pinnatus Linnaeus fil. is not priorable since it is a later homonym of F. pinnatus Hudson (1762: 474; syntype localities: Yorkshire and Sussex, England), a name of uncertain application (Dixon, 1960: 308). Caulerpa pinnata C. Agardh is treated as a nomen novum in accordance with Art. 58.3. According to Howe (1905: 575), the specimens on the type sheet of F. pinnatus Linnaeus fil. (in LINN) are representative of a taxon close to Caulerpa racemosa var. corynephora (Montagne) Weber-van Bosse.