Hormophysa cuneiformis

Thallus bushy, caespitose, 20-50 cm high, yellowish-brown, greenish or dark brown. Main axis terete bearing irregularly, alternately arranged branches in all directions. The branches are foliaceous, consisting of cylindrical axes (1-2 mm in diam.) with leaf-like wings in two-three planes. The wings (0.5-3 cm long) are interrupted at intervals and then proliferating into new wings or branches; the upper portions of the wings truncated, cuneate at the base; margins with large teeth. Vesicles oblong or ellipsoidal, 5-10 mm long, develop in the middle of the swollen wings. Attachment by discoid holdfast. Growing on the lower intertidal to subtidal rocks, in tidal pools, often in association with Sargassum in moderately wave exposed areas.

Tropical and subtropical waters of Indian and Pacific Oceans. Common in the southern Asia-Pacific countries: Japan, China, Vietnam, Thailand, Indonesia, Philippines, Australia and New Zealand, Pacific Islands.