Characters: Colonies branch irregularly forming compact thickets. Branches are fine (less than 3 mm diameter near tips) and mostly straight. They may be upright or prostrate. They may have no corallites on the undersurface. Axial corallites are small. Radial corallites are elongate and strongly appressed.
Colour: Grey or brown.
Similar species: Acropora inermis, which has thicker interlocking (caespitose) branches. See also A. parilis, A. insignis. and A. tizardi
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