Colonies are flat, submassive, usually disc-like, and sometimes free-living. Corallites are cerioid with a large central corallite (up to 35 mm diameter) surrounded concentrically with angular daughter corallites. Septa have fine teeth and usually exsert paliform lobes. Tentacles are extended only on dark nights.
Pale to deep green or brown.
Restricted to turbid water with muddy substrates. Also occurs in muddy areas exposed at low tide.