Crabnote (English name) Amphiroa dilatata Lamour.

Japanese: カニノテ（英語表記）Amphiroa dilatata Lamour.

A seaweed of the red algae Corallinaceae family that grows covering rocks in the bathyal zone along the coast (illustration). It is a calcareous alga that deposits large amounts of calcium carbonate, and its body is as hard as stone. The body branches out repeatedly in a regular fork shape, giving it an overall fan-like shape. There is no distinction between the main axis and the branches, and it is flat with nodes at regular intervals. The body is about 2 mm wide and over 10 cm tall. The body has a front and back, and spores are produced on the back side. It is known to be distributed in Korea, the waters off Japan, Africa, and Australia. Along the Japanese coast, it grows south of the Kanto region, and can also be found on the side walls of slightly deeper tide pools.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

沿岸の漸深帯の岩上をおおうように生育する紅藻サンゴモ科の海藻（イラスト）。多量の炭酸カルシウムを沈着させる石灰藻で，体は石のように固い。体は規則正しく叉（さ）状に繰り返し分枝するので，全形は扇状となる。主軸と枝の区別はなく，扁平で，一定の間隔で節がある。体は幅約2mmで，高さ約10cm以上となる。体には表と裏があり，胞子は裏側につくられる。朝鮮，日本近海，アフリカ，オーストラリアに分布が知られる。日本沿岸では関東地方より南部の沿岸に生育し，やや深いタイドプールの側壁にみられることもある。

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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