Sargassum muticum (Yendo) Fensholt, 1955

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 : 15

* Sargassum muticum (Yendo) Fensholt, 1955

Japanese name: タマハハキモク (tamahahakimoku)

Basionym: Sargassum kjellmanianum f. muticum Yendo, 1955

Type locality: —Izumo Prov., Kii, Honshu, Japan

Description and remarks: —Plants can grow to more than 50 cm tall. The main axis is about 1.5–2 mm in diameter and bipinnately branched. Leaves located on the primary branches and are about 1.4 cm long and slender, not more than 2 mm wide with either smooth or serrate margins. Vesicles are 1.5 mm wide, avoid to elliptical with either smooth apices or with slender leaflets. Branches are longer closer to the base and shorter near the apex of the plant. This species is common along the windward side of Yokoura in the mid spring months and is found together with other species of Sargassum like S. ilicifolium and S. micracanthum .

Material examined: —18ECS1-126-1