Costaria costata (Turner) Saunders

Japanese: スジメ(筋布) - スジメ（英語表記）Costaria costata (Turner) Saunders

A species of brown algae in the Laminaria family, its shape resembles a long bamboo leaf like many other species in the genus Laminaria, but it can be distinguished by the presence of five thin midribs (illustration). Of the five midribs, the one in the middle and the two near the ends rise to the same plane, but the two on the left and right near the center rise to opposite sides. Its life cycle is basically the same as that of the genus Laminaria. It grows below the low tide line in cold seas in the Sanriku region and north of Hokkaido, and the algae can grow to 1-2m in length. It is disliked as a miscellaneous weed among kelp species. It is not particularly used.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

褐藻コンブ科の1種で，その形状はコンブ属の多くの種のようにササの葉を長くのばしたようであるが，5本の細い中肋をもつことで区別される（イラスト）。5本の中肋のうち，中央の1本と両端に近い2本は同一面に隆起するが，中央に近い左右の2本は反対側に隆起する。生活史は基本的にはコンブ属と同じである。三陸地方，北海道以北の寒海の低潮線下に生育し，藻体は長さ1～2mになり，コンブ類の雑藻としていやがられる。とくに利用されることはない。

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