Colonies are arborescent, with thick upright to prostrate branches. They may form stands 7 metres across. In shallow water branches are short and compact, while in deeper water colonies have more open branches. Radial corallites are of mixed sizes and shapes; those near branch tips are long and tubular and similar to axial corallites. Branch tips are very soft and readily crushed.
Usually dark reddish-brown with pale branch ends. Other colours include blue, purple and green, usually with paler branch ends.
A wide variety of environments, especially upper reef slopes and lagoons.
Taxonomic note: This species is divisible into several smaller semi-distinct taxonomic units. Source reference: Veron (2000). Taxonomic references: Veron and Wallace (1984), Wallace (1999). Additional identification guides: Veron (1986), Nishihira and Veron (1995).
displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Acropora grandis.Ryukyu Islands, Japan.Large colony of irregular prostrate branches.Charlie Veron.
Acropora grandis.Philippines.Common appearance in shallow water.Charlie Veron.
Acropora grandis.Philippines.Branch tip. Tubular radial corallites of regular size.Charlie Veron.
Acropora grandis.Houtman Abrolhos Islands, south-western Australia.Detail of a branch tip with multiple axial corallites.Charlie Veron.