Colonies may be over one metre across and consist of irregular but mostly upright tangles of branches. Branches divide irregularly and form short branchlets from incipient axial corallites. Axial and incipient axial corallites are identical; the latter usually have several tubular appressed radial corallites. The coenosteum is smooth.
Shallow reef environments protected from strong wave action. Acropora fenneri, A. derawanensis and A. filiformis may occur together in the same habitat.