Sargassum hemiphyllum (Turner) C. Agardh, 1820, 1821

Belleza, Dominic Franco C., Tateishi, Hiroto, Tanimae, Shin-Ichiro, Kobayashi, Taishun, Aota, Tomoyuki, Urasawa, Toshiki & Nishihara, Gregory N., 2025, An annotated list of brown seaweeds (Phaeophyceae) from Nakadori Island (northern Goto Islands, Nagasaki, Japan), Phytotaxa 694 (1), pp. 1-24 : 14

Sargassum hemiphyllum (Turner) C. Agardh, 1820

Japanese name: イソモク (isomoku)

Basionym: Fucus hemiphyllus Turner, 1811

Type locality: — Nagasaki, Japan

Description and remarks: —Specimen thalli are bushy. The leaves are easily distinguishable for this species as they are coarsely dentate on the outer side while being smooth and entire on the inward side. The vesicles are borne on stalks and may be pyriform, ovoid or obovoid in shape. The vesicle apices may either be round, mucronate or bear a small leaflet, especially in the upper parts of the thalli. This species forms thick stands along the windward side of Yokoura from early spring to early summer.

Materials examined: —18ECS1-47 (1 to 14)