Tafananai, Tutuila, American Samoa, 20 feet

cropped

Rainmaker Pt., Tutuila, American Samoa, 25 feet

Common on reef slopes.  Encrusting plates, massive, or columnar with widely-spaced calices with a distinct columella and smooth septo-costae, calices often in rows parallel to the colony margin.  Color variable.  Red Sea to Japan and the Marquesas.