Habitat: Thick on mangroves, and thin on coral reefs. Distribution: Caribbean wide. Characteristics: Thin to thick encrusting (0.2-4 cm) to massive amorphous. The surface is smooth, shiny, with oscules regularly distributed (.2-1 cm wide). Dark brown to walnut brown or beige, externally, and tan internally. The consistency is soft, elastic, and tough. Notes: Reported as toxic to fish, but eaten by Hawksbill turtles, Eretmochelys imbricata.