Sargassum miyabei

Thallus, coarse, densely branched, to 2.5 m high, Main axis cylindrical, 2-4(-5) cm high. Primary branches smooth, triquetrous, terete, with furrows, bearing secondary short branches with branchlets. Phylloids obovate, cuneate to lanceolate, often asymmetric, to 4.5 cm long, 0.45 cm broad; slightly thickened along the medium line; with or without cryptosomata. Phylloids of branchlets small, cuneate, subcuneate-obovate to lanceolate, thin and papyraceous, slightly asymmetric, with a few cryptostomata (in rows along the medium line). Margins coarsely dentate. Vesicles shortly stalked, oval, ellipsoid sometimes slightly compressed, 3-4 mm broad, apiculate or with spine. Receptacles solitary, narrow, terete, tapering towards apices, in racemose clusters, are develop in axils of ultimate phylloids. Attachment by broadened basal portion of stipe and horizontal creeping rhizoidal outgrowths (less than 1 cm long and 1 mm diam.) issuing from the holdfast. Growing on lower intertidal to subtidal rocks.

Temperate to tropical waters of Pacific Ocean.