Ectocarpus

Japanese: シオミドロ（英語表記）Ectocarpus

A genus of the family Phaeophyceae in the order Phaeophytales, it resembles a brown tuft of hair. Its body is unilinear and branched, and its cells have spiral chromatophores. It is found along the coasts of the world, but the number of species is greater in cold seas. A representative species is E. siliculosus (Dillw.) Lyngb., which grows well in winter and can reach up to 30 cm in length. It is disliked as a pest in seaweed farms. Similar genera include the genus Giffordia , which has many disc-shaped chromatophores and the reproductive organs located relatively high up on the body, and the genus Feldmannia , which also has disc-shaped chromatophores but the reproductive organs are located relatively low on the body and grow on other seaweeds.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

褐藻綱シオミドロ目シオミドロ科の1属で，形状は褐色の髪の束のようである。体は単列糸状で分枝をもち，また細胞がらせん形の色素体をもつことが特徴である。世界各地の沿岸に分布するが，種類数は寒海に多い。代表的な種にシオミドロE.siliculosus (Dillw.) Lyngb.があり，冬季によく生育し，大きいものは長さが30cmにもなる。ノリ養殖場では害藻として嫌われる。似た属に，多数の円盤状の色素体をもち，生殖器官を体の比較的上部につけるギフォルディア属Giffordia，同じく色素体が円盤状であるが，生殖器官を体の比較的下方につけ，しかも体は他の海藻上に生育するフェルドマンニア属Feldmanniaなどがある。

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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