Bull kelp

Japanese: ブルウキモ（英語表記）bull kelp

A seaweed of the Laminaria family of the Phaeophyceae class, with a large spherical air vesicle up to 15 cm in diameter at the end of a long, cylindrical, string-like stem that can reach a length of 25 to 35 m, and numerous long, kelp-like leaves that reach several meters in length at the top of the vesicle. It is distributed from the Pacific coast of the United States to the Aleut Islands. It grows below the low tide line and has a shape similar to that of young kelps, but as it grows, the stem grows long and the boundary between the leaves and the stem specially differentiates to become an air vesicle, which allows the body to rise directly into the sea. Various gases are mixed in the air vesicle, which can reach a volume of 3 liters and is known to contain carbon monoxide.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

長さが25～35mにも及ぶ長い円筒状，ひも状の茎の先に，直径15cmにもなる球形の大きい気胞があり，さらにその上部に数mに及ぶコンブ様の長い葉を多数つける褐藻綱コンブ科の海藻。アメリカ太平洋沿岸からアレウト列島にかけて分布する。低潮線下に生育し，幼時はコンブ類の幼体と似た形状であるが，生長につれて茎が長く伸長し，また葉と茎の境界部が特別に分化して気胞となり，これにより体は海中に直上する。気胞中には種々のガスが混在し，その容積は3lに及び，一酸化炭素を含むことが知られる。

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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