Colonies consist of dense thickets of short cylindrical branches which may form extensive stands. Axial corallites are small. Radial corallites are irregular in size and shape; exsert corallites have prominent lower lips.
Greyish-brown with white branch tips and white branch coenosteum. This colouration is only very distinctive in Japan.
Shallow rocky foreshores or shallow reef flats.
May be locally dominant in Japan, rare elsewhere.
Taxonomic note: Colonies from Japan are distinctive. This species is divisible into several other semi-distinct taxonomic units. Source reference: Veron (2000). Taxonomic references: Veron (1992), Wallace (1999). Additional identification guide: Nishihira and Veron (1995).
displaying probable distribution of species. Points indicate recorded sightings from OBIS.