おおべにしだ (大紅羊歯) [Index] [Back] わが国の本州、東北地方中部以南から四国・九州、それに朝鮮半島や中国の浙江省・四川省に分布しています。山地の林下に生え、高さは２０〜５０センチになります。「べにしだ」に似ていて、やや小型です。葉は２回羽状複葉で黄緑色を帯び、光沢が少なく、紙質です。葉柄基部には、やや光沢があり、茶色から茶褐色の鱗片があります。ソーラスは、小羽片の中肋寄りにつき、包膜は大きくて円形、白色で紅色を帯びません。別名で「ひろはべにしだ（広葉紅羊歯）」とも呼ばれます。中国語では「桃花島鱗毛蕨（tao hua dao lin mao jue）」です。 オシダ科オシダ属の常緑性シダ類で、学名は Dryopteris hondonensis。英名はありません。 The "Oo-beni-shida" (Dryopteris hondonensis) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed from the central parts of the Tohoku region of Honshu south to Shikoku, Kyushu in Japan, as well as the Korean Peninsula, and the Chinese provinces of Zhejiang and Sichuan. It grows in the forests of mountainous areas and is 20 to 50 cm tall. It is similar to "Autumn fern" (Dryopteris erythrosora), but slightly smaller. The leaves are bipinnate compound, yellowish-green in color, and have a papery texture with little gloss. The leaf stalk base has slightly glossy brown to brownish-red scales. The sorus is attached to the midrib of the pinnule, and the indusium is large and round, white and without a red tinge. It is also known by the name "Hiroha-beni-shida" (broad-leaved red fern). In Chinese, it is called "桃花島鱗毛蕨" (tao hua dao lin mao jue). 茨城県つくば市「つくば実験植物園」にて、2025年01月25日撮影。 Shu Suehiro shu@botanic.jp