Sargassum platycarpum

Sargassum platycarpum Montagne

St. David: 7, 67–454, on the boulders. St. Mark: 6, R–298, on the south side, on reef rock at depths of 0.9–6.0 m. Grieve (1909, p. 9) lists this species without citing a definite locality. It does not seem to be as common about the island, or at least not as well developed, as on several other islands of the Lesser Antilles.