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Reef cement
Porolithon pachydermum
(Foslie) Foslie, 1909

This species forms thin, hard, highly calcified encrustations, overgrowing the substrate. It takes on the surface texture of the substrate. Shades of pinkish gray in color.

Most common on subtidal to intertidal reef crest, where it can cover huge areas.

Abundant to common Florida, Bahamas and Caribbean.

Reef cement (Porolithon pachydermum)