Habitat: Common on mangrove roots. Distribution: Caribbean, Gulf of Mexico, Bermuda. Characteristics: Encrusting, to massive amorphous, or ramose. Grayish, bright blue externally, light blue to tan internally. Conulose surface ( comules 1mm high, 2-3 mm apart). Membrane-bearing oscules scattered ( 1- 5 mm wide). Soft and easily torn.