Colonies are arborescent with cylindrical branches but may be corymbose, with horizontally fused basal branches which have upturned ends. They may form stands more than 5 metres across. Branches are smaller than those of the large staghorn Acropora species. Radial corallites are of mixed sizes, with projecting lower lips.
Pale to dark brown or blue, often with pale blue tips.
Usually restricted to shallow back-reef margins.
Usually uncommon but may be a dominant species.