P. damicornis is a colonial coral and can grow into clumps up to 30 cm (12 in) high. It is distinguishable from other members of the genus by the verrucae (wart-like growths) on its surface being more irregularly arranged. It is more branched than the otherwise similar P. verrucosa. Its form varies according to its habitat and is more open and branched in calm positions and more compact on the upper parts of reefs where water movement is greater. Its colour varies and may be greenish, pink, yellowish-brown or pale brown. Cauliflower coral contains microscopic symbiotic dinoflagellate algae (zooxanthellae) living within its tissues. Through photosynthesis, these algae produce energy-rich molecules the coral can assimilate. The density of the dinoflagellates varies depending on seasonal changes in water temperature, light levels, and dissolved nitrate concentration. It is a dynamic process and in extreme environmental conditions results in the complete expulsion of the algae and the bleaching of the coral. However, compared to other corals, this species is resistant to bleaching. Learn more about Pocillopora Damicornis