100% pure fern - 100% pure fern

Japanese: ジュウモンジシダ - じゅうもんじしだ

A perennial fern of the Dryopteris family (illustration), commonly found on the forest floor in the mountains throughout Japan, but especially in moist areas from the upper subtropical zone to the temperate zone. In northern regions, it is summer-green. The lowest pinnae develop and branch into pinnate shapes, giving the leaf surface a cross-like appearance, hence the Japanese name. The rhizome grows upright from an upward slant, with several leaves growing in clusters. The leaves are medium-sized, about 40 cm long, and are single-pinnate to bipinnate with mid-lobes except for the lowest pinnae. The scales are small and membranous, except for those at the base of the petiole, and are attached by pressure to the axis.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

日本各地の山中の林床に普通にみられるが，特に暖帯上部から温帯にかけての湿った場所に多いオシダ科の多年生シダ植物（イラスト）。北の地方では夏緑性となる。最下羽片が発達して羽状に分岐するため，葉面が十文字にみえるので，この和名がつけられた。根茎は斜上から直立し，数枚の葉を叢生（そうせい）する。葉は中型で，長さ40cm程度，最下羽片を除き単羽状から2回羽状中裂。鱗片は，葉柄基部のもの以外は小型･膜質で，軸に圧着してつく。

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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