Palisada perforata

Thallus solitary or grouped, cartilaginous, tough, 3.5-6 (-10) cm high, consisting of prostrate and erect branches, light olivebrown to dark reddish-brown. Branching irregular, or alternate. Branches terete, 1-2 mm diam., naked at basal portion and densely covered by ultimate papillary branchlets from all sides in the middle and upper portions, often in longitudinal rows. The branchlets short wartlike, knobby, or club-shaped, perpendicular to branches, 0.5-0.7 mm diam., 0.5-2.5 mm long, terminating in apical pits. Sporangia spherical, to 100 μm diam., tetrahedrally divided, near the top of branchlets. Holdfast discoid or padlike. Growing on hard substrate, exposed to moderate wave action, intertidal, often covered by sand, exposed to air during low tide.

Note: A source of organohalogen compounds (sesquiterpenoids) with antibacterial and antifungal activities.

Worldwide in subtropical and tropical waters.