Characters: This is a primarily azooxanthellate species forming extensive thickets. Colonies consist of clumps of fine twisted branches. Corallites are subcerioid, closely compacted and circular, with solid conical columellae. Usually ten septa are present. These are exsert and fused with the columella deep within the corallite. The coenosteum is covered by fine spinules. Tentacles are usually extended only at night.
Colour: Mottled brown or green.
Similar Species: Madracis asperula.
Habitat: Deep water, usually below 50 metres depth.
Abundance: Common, but seldom seen by divers.
Taxonomic Note: Primarily azooxanthellate species.
Taxonomic References: Yabe and Sugiyama (1936a); Veron (2000a);
Identification Guides: Nishihira and Veron (1995);
