Characters: Colonies are cerioid with neat angular corallites up to 8 millimetres diameter. Septa have 1-3 large teeth. Colonies have a thick fleshy mantle usually covered with fine papillae.
Colour: Brick-red or green in northern Japan, grey elsewhere.
Habitat: Protected reef environments and rocky foreshores.
Abundance: Uncommon in mainland Japan, rare elsewhere.
Taxonomic Note: May be difficult to separate from other Micromussa.