Characters: Colonies are submassive to encrusting, with angular corallites 8-15 millimetres diameter. ‘Groove and tubercle’ formations are well developed. Long and short septa strongly alternate, are thickened over walls and are uniformly toothed. Colour: Usually green, brown or yellow with white septa and sometimes green oral discs. Similar species: Montastrea colemani. See also M. magnistellata. Habitat: Most reef environments. Abundance: Usually uncommon.