Characters: Colonies are encrusting or submassive or form a complex of horizontal plates and large irregularly dividing upright bifacial fronds. Corallites are in deep valleys which are concentric on plates and generally less than 50 millimetres long. Colour: Tan, brown or yellow-brown. Similar species: Agaricia tenuifolia, which has smaller, thinner, more divided fronds with thinner margins and less tendency to form horizontal plates. Habitat: Shallow reef environments. Abundance: Common