Shield fern

Japanese: shield fern（英語表記）shieldfern

...The sporangium is located between the midrib and the margin of the pinnae, and the intumescent membrane is shield-shaped, covering the sporangium in the young leaves in an umbrella-like shape. More than 200 species of Polystichum (shield fern) are known worldwide, and about 30 species are found in Japan, but there are many interspecific hybrids in nature, making classification quite difficult. Polystichum is a lowland, sun-loving species that is distributed from Korea to mainland China. ...

*Some of the terminology that mentions "shield fern" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…胞子囊群は小羽片の中肋と辺縁の中間につき，包膜は楯形で，若い葉ではこうもり傘状に胞子囊群をおおう。イノデ属Polystichum(英名shield fern)は世界に200種以上が知られ，日本にも約30種を産するが，種間雑種も自然界に多く，その分類はかなりむずかしい。イノデは低地の好陽地性の種で，朝鮮から中国大陸にも分布している。…

※「shield fern」について言及している用語解説の一部を掲載しています。

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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