Characters: Colonies have irregular to submassive bases and irregular branches and may form thickets over 3 metres across. Axial corallites are small. Radial corallites are aligned along branches, and are appressed with thick lips and wide openings. Colour: Mottled yellowish-grey and dark green. Similar species: Acropora striata and A. pruinosa. See also A. parahemprichii. Habitat: Rocky foreshores in shallow turbid water. Abundance: Locally common.