Colonies may be zooxanthellate or azooxanthellate depending on light availability. Azooxanthellate colonies form extensive banks while zooxanthellate colonies form clumps of tapered fused branches less than 0.5 metres across. Corallites are exsert, 2-3 millimetres diameter. Septa are in three cycles.
Tan, lavender, or dark brown.
Zooxanthellate colonies occur in protected environments as little as 5 metres deep.