Fusinashimidoro - Fusinashimidoro

Japanese: フシナシミドロ - ふしなしみどろ

A genus of green, filamentous, tubular algae that grows abundantly in paddy fields and ditches; it branches irregularly and forms a mat-like structure. The body is polynuclear, consisting of a single cell without a septum. Sexual reproduction is by the union of eggs and sperm produced in the oophores and antheridium on the sides of the body. Asexual reproduction is by zoospores produced at the tips of the filaments. The zoospores are large, aggregated zoospores that are spherical or elliptical, have many equal-length flagella, and are up to 100 μm in diameter. Fusarium was previously classified as a green algae, but many scholars now classify it as a member of the Xanthophyceae class because of its characteristics of not having chlorophyll b as a photosynthetic pigment, its storage material being oil rather than starch, and the fact that the sperm have two flagella on the sides, the one that extends forward, has a pinnate structure.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

水田や溝などに多く生育する緑色，糸状の管状藻類の1属で，不規則に分枝して全体はマット状を呈する。体は多核体で，隔膜のない1個の細胞から成る。有性生殖は体の側部にできる生卵器と造精器でつくられる卵と精子の合体による。無性生殖は糸状体の先端につくられる遊走子による。遊走子は球形ないし楕円形で，等長の2鞭毛を多数もち，直径が約100μmにも及ぶ大型の集合性遊走子である。フシナシミドロは以前は緑藻類に所属させられたが，光合成色素にクロロフィルbをもたないこと，貯蔵物質がデンプンでなく油であること，精子が側部にもつ2鞭毛のうち，前方にのびるものは羽形構造であることなどの特徴から黄緑藻綱に所属させる学者が多い。

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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