Description:
Cartilaginous, dark purplish-red fronds, frerquently iridescent under water when in good condition, to 150 mm high. Stipe compressed, narrow, expanding gradually onto a flat, repeatedly dichotomously branched blade, in tufts from a discoid holdfast. Axils rounded, apices blunt or subacute, frond thicker in centre than margins. Very variable in breadth of segments.
Habitat:
On rocks, in pools, lower intertidal and shallow subtidal, widely distributed, abundant.