Corallum arborescent. Branches coalescent at basal portion, prominently noduled at the sides, producing subcylindrical divergent branchlets; heavy, main ones up to 30-40 mm in diameter at bases, around 70-80 mm high, tapering to blunt ends of branchlets which are around 8 mm diameter at 5 mm below the tips. Living portion only upper 10 cm or less.

Calicles 1.5-2 mm diameter measured between thecal summits. Calices circular, uniformly excavate all over, almost uniformly distant, a little over 1 mm diameter, separated by very reticulate intercalicinal area of less than 1 mm wide. Wall flaky without central ridge; mural trabeculae topped with heavily frosted, irregularly shaped denticles which are not joined together.

Septa triangular, thick so loculi correspondingly thin; their edges smooth, surfaces very finely granulate. Pali 6 or 8, bushy, those of lateral pairs always larger than the rest. Only one septal tubercle, close to wall; wide gap between it and corresponding palus.

Columella a horizontal plate joined to the septa, with or without a bushy tubercle, which, when present, always lower than pali.

Remarks:This species is very abundant in Puerto Galera Bay. It is bright yellow in color in life. Its calicular structure is quite close to that of P. nigrescens but for its being more deeply excavate and distinctly circular calice. The heavy attenuate branches with prominent nodules make this species easily recognizable.

Source:Nemenzo F (1955) Systematic studies on Philippine shallow water scleractinians: I. Suborder Fungiida. Nat. Appli. Sci. Bull. 15:3-84. 14 pls.