Corallum dendroid. Branches 15-20 cm high, proliferous, cylindrical at base (20-25 mm dimaeter), flattened on upper portion; topped with larger axial corallites; smaller radial corallites at sides.

Radial corallites cylindrical, basal and terminal almost equal; in 2 opposite, deflected alternately to opposite sides; ascending, up to 15 mm high on lower side, up to 8 mm on upper. Calice 6-8 mm average diameter, circular or subcircular. Giant corallites, 10-12 mm across also present in some places. Calicinal fossa deep; wall thin, very porous.

Septa thin, very narrow at calicinal rim, gradually broadening downward; primaries and sometimes secondaries much broadened at lower half. The three cycles markedly distinguishAble by their width. Septal edge entire or granulate, thickened towards columella; surfaces prominently spinulate.

Costal ridges running throughout length of branches but becoming less distinct towards distal ends of corallites, edges armed with low spinules irregularly disposed, not in rows. Intercostal furrows with deep pits, usually narrower than ridges.

Columella reticulate, poorly developed, usually with very low tubercles. Giant corallites with large convex, reticulate columella.

Source: Nemenzo F (1960) Systematic studies on Philippine shallow water scleractinians: IV. Suborder Dendrophylliida. Nat. Appli. Sci. Bull. 18: 1-21, 10 pls.

Editor's Note:The species name appears as D. micranthus in Nemenzo’s original publication, but is listed as D. micrantha in the World Register of Marine Species.