Corallum laxly arborescent; branches spreading outward at wide angle except towards apical regions where branchlets are ascending, usually arising almost at same place at both sides of stem. Surface crowded with erect corallites of various heights. Stem regularly terete, tapering gradually only at upper portion; 16 mm diameter (only a portion available). A terminal branchlet still undivided: 11.5 cm long, 12 mm diameter at base, 9 mm at middle, 3.5 mm just below axial corallite.

Axial corallite relative small, 2-2.5 mm across, 1.5-2 mm exsert; wall rounded at tip, heavily echinulate.

Radial corallites all cylindrical or compressed cylindrical, crowded, erect, only very slightly ascending towards apices; varying in size from small ones less than a mm diameter, about 1 mm high to prominent ones 2-2.5 mm diameter, 2.5 mm high. Calice round, terminal in small corallites; slightly oval, slightly oblique in large ones. Wall striate-echinulate. Here and there tall bigger corallites with buds stand out prominently..

Primaries in all corallites very wide, reaching beyond half radius points but directives only slightly distinguishable. Secondaries may be present as very narrow plates or series of low spines. In some axials, few tertiaries present.

Intercalicinal areas pilose, the spinules truncate, even in height, continued into calicular wall. In some areas, spinules exhibit arrangement in crooked rows. Reticulum obscure; pores tiny, discernible slightly in few places.

Remarks: This coral is quite close to A. Formosa and A. listeri. From the first, it differs by its large size, by its broad primaries, the directives not usually distinguishable; from the latter by the growth form, by the absence of small nariform or subimmersed corallite among the large ones, and by its well developed primaries.

Source: Nemenzo F (1967) Systematic studies on Philippine shallow water scleractinians: VI. Suborder Astrocoeniida (Montipora and Acropora). Part I - Text. Nat. Appli. Sci. Bull. 20 (1- 2): 1-141