Colonies consist of dense thickets of prostrate tapered, curving branches which occasionally fuse. Sub-branches are formed at frequent intervals and branch acutely. Axial corallites are moderately exsert. Incipient axial corallites cover the upper surface of horizontal branches. Radial corallites are of two sizes on main branches. On sub-branches they are exsert and tubular, with fine fluted margins giving colonies a spiky surface.
Brown, blue and yellow.
Shallow reef slopes and flats.
Occasionally locally common, usually rare.