Characters: Colonies are submassive, encrusting, laminar or subarborescent. Much of this variation may occur in the same colony but some colonies are composed only of plates. Hydnophores are 5-8 millimetres diameter. Tentacles are often extended day and night; they are long and shaggy and of uniform length. Colour: Cream or dull green. Similar species: Hydnophora microconos, which is massive, rounded, with smaller monticules. See also H. bonsai and H. pilosa. Habitat: All reef environments, but especially lagoons and protected slopes. Abundance: Common.