Dichotomosiphon tuberosus (Braum) Ernst

Japanese: チョウチンミドロ（英語表記）Dichotomosiphon tuberosus (Braum) Ernst

It is a hairy green alga that grows in rice paddies and ditches in the Okinawa region, and its Japanese name comes from the fact that it has a spherical egg-laying organ at the end of its body, which resembles a paper lantern. The body is multinucleated, 40-110 μm in diameter and up to 10 cm in height, and is regularly branched into a fork shape with constrictions at the base of the branches. However, there are no septa separating the cells. Because the body is multinucleated and tubular, it is often classified in the order Myrales (or Polytrichum), along with marine green algae such as Myrtle and Rock Creeping Tussock. However, some scholars have established the order Dictyosiphonales, emphasizing its characteristics such as sexual reproduction by eggs and sperm and the presence of chlorophyll-free white bodies in addition to chloroplasts (Feldmann J.Feldmann, 1954).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

沖縄地方の水田や溝などに生育する毛状の緑藻で，和名は体の先端に球形の生卵器をもつようすが提灯に似ることに由来する。体は多核で，太さ40～110μm，高さ10cmくらいまでになり，規則正しく叉（さ）状に分枝し，枝の基部にはくびれがある。しかし細胞を仕切る隔壁はない。体が多核管状であることから，海産緑藻のミルやイワヅタなどとともにミル目(またはクダモ目)に分類する場合が多いが，卵と精子による有性生殖を行うこと，葉緑体のほかにクロロフィルを含まない白色体をもつことなどの特徴を重視して，チョウチンミドロ目Dictyosiphonalesを設立する学者もある(フェルドマンJ.Feldmann,1954)。

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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