Athyrium filixfemina (English spelling) Athyriumfilixfemina

...A perennial plant of the Mesentaceae family that grows under mountain forests. In the broad sense, Mesida refers to A. brevifrons Nakai and A. brevifrons Ezome. A. brevifrons Nakai is summer green. The rhizomes grow obliquely upwards and the leaves grow in clusters. The petiole is the same length or half as long as the leaf blade, brownish-brown at the base, lanceolate, and densely covered with scales along the entire edge. The leaf blade is broadly egg-lanceolate, 40-60 cm long, 20-40 cm wide, herbaceous, and deeply pinnately lobed 3 times. The pinnae are linear-lanceolate. The pinnae are deeply pinnately lobed, and the leaf margins have sharp serrations.

*Some of the terminology that mentions "Athyrium filixfemina" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…山地の林下に生じるシダ植物メシダ科の多年草。広義のメシダはエゾメシダとミヤマメシダをさし，狭義にはエゾメシダA.brevifrons Nakaiをさす。エゾメシダは夏緑性。根茎は斜上し，葉を叢生（そうせい）する。葉柄は葉身と同長から半分，基部には茶褐色，披針形で，全縁の鱗片が密生する。葉身は広卵状披針形，長さ40～60cm，幅20～40cm，草質で，3回羽状に深裂する。羽片は線状披針形。小羽片は羽状に深裂して，葉縁は鋭鋸歯がある。…

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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