Colonies are flattened hemispheres, usually with regular, smooth surfaces. Corallites are small and the wall between them may be relatively wide.

Close observation shows a clear, oval pin-head sized collumella in the centre of each corallite. It is cream, tan, grey or brown, with a dark rim between the septa around the upper rim of the polyps.

Tentacles are commonly extended during daylight. When touched, these rapidly retract, causing a slight colour change, giving this coral a common name of ’blushing star coral’.