Characters: Colonies are generally branching and vary from perforated plates to cushion-shaped. Branches may be flattened or tapered. Axial corallites are often devoid of radial corallites on their upper surface. Radial corallites are all similar and are usually aligned along branches. They change along the branch from immersed to tubular and appressed.
Colour: Usually dark brown or greenish brown, sometimes with light brown or blue branch tips or dark blue with whitish tips.
Habitat: Upper reef slopes, lagoons and fringing reefs.
Abundance: Common, may be a dominant species.
Taxonomic Note: A species complex.