Habitat: Common on mangrove roots, and corals. Distribution: Caribbean, Florida, South Carolina Characteristics: Thick crust with or without oscular mounds (1-4 cm thick, 2-4 cm high). Gray to bluish-purple externally, lighter color internally. Oscula 0.5-1 cm wide. Smooth, strongly punctuate surface, almost hispid looking. Soft, sticky to the touch.