Palisada concreta

Thallus rigid, cartilaginous, greenishbrown to dark purple or almost black, forming prostrate, strongly adherent to the substratum at several points compact cushions (rather brittle), to 25 cm in diam., 1-3 cm thick, consisting of densely coalesced branches. Branches thick, cylindrical, 2-3 mm in diam. Branching irregular, alternate, opposite or subverticillate. Branchlets short, wart-like, with blunt tips, develop from all sides. Growing on rocks, dead corals in low intertidal and upper subtidal, at соаstal localities exposed to moderate and strong wave action.

Note: A source of polyphenolics; antibacterial activity.

Subtropical and tropical waters of Pacific Ocean. Found in Taiwan, Thailand, Vietnam, Australia and New Zealand.