Iwagane-sou (English name) bamboo fern

Japanese: イワガネソウ（英語表記）bamboo fern

A perennial fern of the Caprifoliaceae family (illustration). It is evergreen, but in cold regions it becomes summer-green. The rhizomes are long and creeping, often forming large colonies. The leaf blades are long to broadly ovate, bipinnate and compound, and the larger ones can be over 1m long. The upper parts of the pinnae and pinnae are gradually pointed, the lateral veins are reticulated, and the vein ends do not reach the bottom of the serrated leaf margin. It is often found in moderately deep, slightly moist soils in warm areas south of Honshu, and since it matches well with the location conditions of Japanese cedar forests, it is sometimes used as an indicator for reforestation. The leaves of young plants are simple, and often have yellow-green hawk's feather-like spots along the midrib, so it is sometimes cultivated for ornamental purposes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ホウライシダ科の多年生シダ植物（イラスト）。常緑性だが，寒い地方では夏緑性となる。根茎は長くはい，しばしば大きな群落を作る。葉身は長卵形から広卵形，2回羽状複生，大きなものは長さ1mをこえる。羽片や小羽片の上部は漸尖し，側脈は網状に結合，脈端は葉縁の鋸歯の底に届かない。本州以南の暖地の，適度に深いやや湿った土壌のところに多く，スギ林の立地条件とよく一致するため，造林のさいの指標とされることがある。幼植物の葉は単葉で，しばしば中肋に沿って黄緑色の鷹の羽様の斑が入るので，観賞用に栽培されることがある。

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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