Characters: Colonies consist of prostrate or upright, tapered branches which have many branchlets and incipient axial corallites. Corallites are immersed to long and tubular, giving branches a rough, irregular appearance. Tentacles are not extended during the day.
Colour: Deep blue (which may photograph mauve) or brown.
Similar Species: Acropora horrida, which has smaller, more compact corallites and tentacles extended during the day.
Abundance: Common at Elizabeth and Middleton Reefs of south-east Australia, rare elsewhere.
Taxonomic Note: Similar to Acropora horrida but much less common.