Dictyota dichotoma (Hudson) Lamour.

Japanese: アミジグサ(網地草) - アミジグサ（英語表記）Dictyota dichotoma (Hudson) Lamour.

This is a representative seaweed of the brown algae family Dictyostelidaceae, so named because of the fine mesh pattern on its body (illustration). The body is yellowish brown and band-like, and branches out almost regularly into a fork shape, reaching a height of 7 to 15 cm and a width of 0.5 to 1.0 cm. At the tip of the body is a large apical cell that divides and grows vigorously. Reproduction occurs from late spring to summer, producing spotted patterns of oophores, antheridia, or tetrasporangia that can be seen with the naked eye on the body surface. Eggs are laid approximately 1 to 2 days before the new moon and full moon, and the fertilized eggs germinate into diploid (2 n ) sporophytes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

褐藻アミジグサ科の代表的な海藻で，体に細かい網目模様のあることから，この名がある（イラスト）。体は黄褐色，帯状で，ほぼ規則正しく叉（さ）状に分枝し，高さ7～15cm，幅0.5～1.0cmになる。体の先端には大型の頂端細胞があり，盛んに分裂して生長する。生殖は晩春から夏の時期で，体表に肉眼で認められる生卵器，造精器，あるいは四分胞子囊を斑紋状につくる。放卵は新月と満月のほぼ1～2日前に起こり，受精卵は発芽すると複相(2n)の胞子体となる。

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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