Polysiphonia (Thread Grass)

Japanese: イトグサ(糸草) - イトグサ（英語表記）Polysiphonia

A marine red alga of the Rhodomelaceae family. Four or more tubular pericentric cells surround a single tubular central cell, and the nodes thus formed connect to form a filamentous or cylindrical body. The scientific name "poly" (multiple) and "siphon" (tube) come from this. There are many species, with more than 30 species known to grow just off the coast of Japan. The body is forked or forked-like alternately, and the branches further produce small branches, with the entire body often becoming tufted. Sexual reproduction is by egg cells and sperm, and asexual reproduction by tetraspores.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

フジマツモ科の海産紅藻。1個の管状の中心細胞のまわりを，4個またはそれ以上の管状の周心細胞がとりかこみ，このようにしてできた節部が連結して糸状または円柱状の体をつくる。学名のpoly(多)，siphon(管)はこのことに由来する。種類数が多く，日本沿岸だけでも30種以上の生育が知られる。体は叉（さ）状，または叉状様互生に分枝し，枝はさらに小枝を出し，体全体はふさ状になるものが多い。有性生殖は卵細胞と精子，無性生殖は四分胞子による。

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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