Characters: Colonies are encrusting or laminar plates which frequently exceed one metre across. Plates have small irregular folds on the surface. Corallites are crowded between the folds except towards the periphery where they are aligned in rows parallel to the margins. They are outwardly inclined. Septo-costae are fine and even.
Colour: Mottled brown and green, usually dark colours if shaded.
Habitat: Reef slopes protected from wave action, especially steeply sloping or vertical walls.
Abundance: Sometimes common.
Taxonomic Note: A species complex.
Identification Guides: Randall and Myers (1983); Veron (1986a); Sheppard and Sheppard (1991); Nishihira and Veron (1995); Coles (1996); Pillay, Terashima, Venkatasami et al. (2002); Chan, Choi, McCorry et al. (2005); Fenner (2005); Pichon, Benzoni, Chaineau et al. (2010); Turak and DeVantier (2011b);