Reef cement
Porolithon pachydermum
(Foslie) Foslie, 1909
Description:
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.
Habitat:
Most common on subtidal to intertidal reef crest, where it can cover huge areas.
Distribution:
Abundant to common Florida, Bahamas and Caribbean.