Characters: Colonies are laminar and bifacial, submassive or encrusting, sometimes forming contorted branches. Corallites are 3.5-4.5 millimetres diameter. Columellae are large, and paliform lobes are not well developed. Primary septa may be thick and are always exsert.
Colour: Usually grey, sometimes pale cream to dark brown or green.
Habitat: Shallow protected reef environments.
Abundance: Usually uncommon.
Identification Guides: Veron (1986a); Sheppard and Sheppard (1991); Nishihira and Veron (1995); Pillay, Terashima, Venkatasami et al. (2002); Pichon, Benzoni, Chaineau et al. (2010); Turak and DeVantier (2011b);