Colonies of P. fungiformis are generally encrusting, and can be across. larger colonies additionally have bifurcating upright or sloping branches which tend to have flattened ends, and which can grow to in length. Irregular verrucae grow on the surface of the coral, and on branches growing at oblique angles, the verrucae are more abundant on the upper side. The individual corallites are small and crowded, each having one septum more developed than the rest. This coral is some shade of greenish-brown.