Characters: Colonies consist of open branches which are usually twisted into irregular shapes. Sub-branches are uncommon. Axial corallites are tubular; incipient axial corallites occur on branch sides. Radial corallites are irregular, immersed to tubular, giving branch surfaces a rough appearance. Tentacles are often extended during the day.
Colour: Usually grey.
Similar species: Acropora horrida, which has similar rough branches but corallites are smaller, without the development of many incipient axial corallites. See also A. lutkeni.
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