Channelled wrack

Japanese: エゾイシゲ - えぞいしげ（英語表記）channelled wrack

This brown seaweed of the Fucus family grows in colonies on rocks in the intertidal zone of cold waters, repeatedly branching into a fan shape. The lower part of the body is cylindrical, while the upper part is somewhat flattened and the tip is spatula-shaped. It is yellowish brown to dark brown, and can grow to a height of 10 to 20 cm or more. It is distributed along the coast of Hokkaido and the Pacific coast of northern Honshu. The closely related species Fucus, which has a similar distribution, is leaf-like and has a midrib, making it easy to distinguish. The similarly named Ishige is also a brown seaweed that grows in the intertidal zone, but in a completely different taxonomic group, the Chlorella order, and has a small body height of 5 to 10 cm, and is found only in warm currents south of Ibaraki Prefecture, in contrast to the others.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

寒海域の潮間帯の岩上に群生し，叉（さ）状に分枝を繰り返して扇状になる褐藻ヒバマタ科の海藻。体の下部は円柱状であるが，上部はやや平たく，先端はへら形になる。黄褐色ないし暗褐色で，高さ10～20cm，またはそれ以上になる。北海道沿岸および本州北部太平洋沿岸に分布する。似た分布を示す近縁種ヒバマタは葉状で，中肋をもつので区別は容易である。似た名まえのイシゲはやはり潮間帯に生育する褐藻であるが，分類上の所属は全く異なり，ナガマツモ目の仲間であり，体は高さ5～10cmと小型で，分布も茨城県以南の暖流海域のみと，対照的である。

出典　株式会社平凡社世界大百科事典第２版について　情報

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