We extend special thanks to Philippe & Guido T. Poppe von Poppe Images, Marine Iconography of the Philippines Archipelago who provided this excellent photo.
Characters: Colonies are usually columnar. The columns are club-shaped, sometimes divide, and are slightly flattened in section. Corallites are widely separated, circular in outline, with a solid conical columella. Eight primary septa are distinctive. The coenosteum has fine spinules.
Colour: Usually green with yellow oral discs.
Habitat: Lower reef slopes protected from wave action.
Similar species: Madracis decactis, Madracis mirabilis
Source: Corals of the World by Charlie J.E.N. Veron