Characters: Colonies are unifacial laminae, usually horizontal, which may develop upright ridges . They commonly form stands several metres across. More than one row of corallites may occur between ridges. Columellae are absent.
Colour: Pale brown to deep grey, often with pale margins.
Similar Species: Pachyseris gemmae.
Habitat: All reef habitats but most common on lower reef slopes.
Abundance: Common.
Taxonomic References: Veron and Pichon (1980); Veron (2000a);
Identification Guides: Randall and Myers (1983); Veron (1986a); Sheppard and Sheppard (1991); Nishihira and Veron (1995); Pillay, Terashima, Venkatasami et al. (2002); Turak and DeVantier (2011b);