Characters: Colonies may be over 2 metres across and are composed of irregularly contorted tubes with hollow centres or, rarely, solid branches. Corallites are 3-5 millimetres diameter and are usually conical. They have three cycles of septa, the first two cycles reaching the columellae, which are well developed. Paliform lobes are prominent.
Colour: Uniform brown or dark blue-grey.
Habitat: Shallow protected reef environments.