Colonies are encrusting to slightly dome-shaped and up to 160 millimetres across. Corallites are cerioid, polygonal and 3-6 millimetres diameter. Septa are evenly spaced and usually fuse with each other in fan-like groups. They have fine, saw-like teeth. Columellae consist of one to four pinnules.
Pale grey with distinctive white corallite walls. Uniform brown in the western Indian Ocean.
Very shallow water, attached to bare rock.