Characters: Colonies are encrusting or form thick plates with low irregular ridges. Corallites are small, shallow, and irregularly distributed. Primary septo-costae have a petaloid shape. Colour: Uniform pale to dark grey, tan or brown, sometimes brightly coloured. Similar species: Psammocora nierstraszi, which has similar corallites but has well defined ridges between them. See also P. profundacella. Habitat: A wide range of reef environments. Abundance: Common but inconspicuous