Macrocystis pyrifera (L.) C.Ag. - Macrocystis pyrifera (L.) C.Ag.

Japanese: オオウキモ(大浮藻) - オオウキモ（英語表記）Macrocystis pyrifera (L.) C.Ag.

This is the world's largest brown algae of the Laminaria family, growing up to 50-60m in length. It is also known as giant kelp. The body has a clear distinction between roots, stems, and leaves, and relatively thin, cylindrical, elastic stems extend from a clump-like attachment point formed by the entanglement of branched, thread-like roots. The stems branch out two or more times near the base, and numerous naginata-shaped leaves grow unevenly. The leaves contain gas-containing pneumatizes in the petioles, so the body extends toward the seawater surface, with the upper parts floating on the water's surface, forming what is known as a forest canopy.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

長さ50～60mにもなる世界最大の褐藻コンブ科の海藻。ジャイアント･ケルプgiant kelpともいわれる。体は根，茎，葉の区別が明瞭で，分枝をもつ糸状の根がからまるようにしてできた塊状の付着部から，比較的細い円柱状の弾力性のある茎が長くのびる。茎は基部付近で2～数回叉（さ）状に分岐し，なぎなた状の葉を多数偏生する。葉は葉柄の部分にガスを含む気胞をもつので，体は海水面に向かって伸び，上部は水面に漂い，いわゆる林冠を形成する。

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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