May form dome-shaped colonies over 3 metres across, composed of isolated subcolonies which are shaped like upturned hands. Colonies (or subcolonies) are digitate, with thick branches tapering to a small axial corallite. Colonies exposed to strong wave action have pyramid-shaped branchlets. Radial corallites are uniform in size and usually arranged in rows.
Blue (which may photograph purple) or cream, usually with pale branch tips of contrasting colours.
Upper reef slopes.
Sometimes common in eastern Australia, usually uncommon elsewhere.