Characters: Colonies are laminar and bifacial, sometimes forming contorted branches. Corallites are 3.5-4.5 millimetres diameter. Columellae are large, and paliform lobes are not well developed. Primary septa may be thick and are always exsert. Colour: Usually grey, sometimes pale cream to dark brown or green. Similar species: Echinopora horrida, which has similar corallite characters but is usually branching whereas E. gemmacea is usually laminar. See also E. hirsutissima. Habitat: Shallow protected reef environments. Abundance: Usually uncommon.