Sargassum mcclurei

Thallus coarse, leathery, densely branched, yellowish-brown, to 2 m high. Main axis very short, terete, 5 mm high, bearing primary branches to 1.5 m long, smooth, flattened at base and cylindrical above, bearing secondary branches with branchlets. Phylloids cuneiform at base, obovoid to elliptical from the middle portion to tips, asymmetrical; midrib absent or indistinct, vanishing towards apex. Phylloids of secondary branches slightly broader than long with serrulate-dentate margins. Vesicle consisting of oval, elongate ellipsoid, flattened cyst embedded in phylloid. Cryptostomata prominent, scattered over the surface of phylloids. Plants dioecious: male receptacles elongate, elliptical, smooth, rarely dentate, borne in the axils of phylloids and vesicles. Female receptacles elongate, obcuneate or triquetrous, crowned with teeth on the apices. Attachment by simple expanded disc-like holdfast. Growing on lower intertidal to subtidal rocks.

Tropical and subtropical waters of Indian and Pacific Oceans.