Characters: Colonies are composed of thin, unifacial laminae usually forming upright whorls. These whorls may be over one metre high and may cover a large area. They fall over at the slightest touch. The coenosteum is rough with small papillae. Most corallites are embedded; others are tiny and often inclined irregularly on tuberculae. Colour: Pale brown or greenish. Similar species: Montipora friabilis. See also M. foliosa, M. capricornis and M. delicatula. Habitat: Shallow turbid environments. Abundance: Common.