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Watercress alga
Halimeda opuntia
(Linnaeus) Lamouroux, 1812

Thick, profusely branched clumps of rounded three-lobed or ribbed leaf-like segments, between 10 and 25 cm in height. The branches are numerous and are in different planes, rather than nearly in a single plane as some other species are. This alga can cover larger areas with a dense mat so that individual plants are indistinguishable.

They grow in shallow depressions, cracks and crevices, between hard corals and other somewhat protected areas of the reef, down to 55 m.

South Florida, Bahamas and Caribbean.

Watercress alga (Halimeda opuntia)