Characters: Colonies have partly encrusting basal laminae with irregular upgrowths. The whole colony surface is covered with elongate tuberculae, which are inclined on the colony surface and are fused into ridges on the ends of upgrowths. Corallites are immersed between the tuberculae and are aligned in vertical rows between ridges on upgrowths. Colour: Greenish-grey with contrastingly coloured polyps. Similar species: Montipora monasteriata, which has less elongate tuberculae and M. undata, which has similar coenosteum ridges. See also M. saudii, which does not have tuberculae aligned on ridges. Habitat: Shallow reef environments. Abundance: Usually uncommon