Characters: Colonies are corymbose clumps of prostrate branches, except those from reef flats which have thickened upright branchlets. Horizontal branches are thin, spreading and laterally fused. The undersurfaces of branches are usually devoid of corallites. Upward projecting branchlets are irregularly spaced. Axial and incipient axial corallites are well defined.
Colour: Grey with pale branch tips.
Similar species: Acropora aculeus has similar diverging horizontal branches but finer and more appressed radial corallites. See also A. elseyi, which has primarily upright branches.
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