Corallum large, irregularly branching. Branches arising in cluster at about same level; arcuate, tapering gradually to blunt apex. Living portion up to 20 cm. main branch 14 mm diameter at base. One side branch 17 cm long, 12 mm diameter at base, 10 mm at middle, 3.5 mm just below axial corallite. Surface very rough because of irregularity of height and position of radials.

Axial corallite relatively small; 2 mm diameter, 1-1.5 mm exsert. Wall moderately thick, porous, costulate. Septa in 2 complete cycles; primaries wide, almost reaching center of fossa, directives very slightly wider; secondaries half as wide or less.

Radial corallites crowded, all tubular but of unequal height. Tallest 1-1.2 mm diameter, up to 3.5 mm high, projecting almost vertically; distal end slightly constricted; calice oblique or facing upward; longer lower lip thicker than shorter upper lip. Smaller ones of various height and diameter interspersed among tall ones; their calices terminal or slightly subterminal. Wall of all radials porous, distinctly costulate; costae smooth on distal corallite, echinulate on older ones. Primaries slightly developed, directives often meeting across fossa. Very narrow secondaries occasionally present on large corallites, cycle incomplete; usually wanting in small corallites.

Intercalicinal areas covered with short spines arranged in distinct rows topping continuation of costae from calicinal wall. Reticulation not very evident.

Remarks:The various positions and sizes of the radial corallites make this coral distinct.

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.Astrocoeniida 55.