はこねおおくじゃく (箱根大孔雀) [Index] [Back] わが国の本州、東北地方から近畿地方、それに九州に分布しています。山地の林床や沢沿いの斜面に生え、高さは５０〜９０センチになります。「おおくじゃくしだ（大孔雀羊歯）」と「おくまわらび（雄熊蕨）」との種間交雑種です。葉は単羽状複葉で黄緑色から緑色、やや光沢があり、やや厚い紙質です。羽片は１５〜２０対つきます。羽片の葉脈の表面は著しくくぼんで溝ができ、小脈は２岐のものが混ざります。ソーラスは葉身上部半分につき、下部では辺縁寄りに、上部ではやや中間につきます。包膜は円腎形です。 オシダ科オシダ属の常緑性シダ類で、学名は Dryopteris x hakonecola。英名はありません。 The "Hakone-oo-kujaku" (Dryopteris x hakonecola) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed from the Tohoku region to the Kinki region of Honshu and Kyushu. It grows on the forest floor in mountainous areas and on the slopes along streams, and is 50 to 90 cm tall. It is an interspecific hybrid between the "Oo-kujaku-shida" (Dryopteris dickinsii) and the "O-kuma-warabi" (Dryopteris uniformis). The leaves are pinnate compound, yellowish-green to green in color, slightly glossy and of a slightly thick papery texture. There are 15 to 20 pairs of pinnae. The veins on the upper surface of the pinnae are deeply grooved, and the secondary veins are mixed with those that fork. The sorus is located on the upper half of the leaf blade, and is located closer to the margin on the lower half, and slightly in the middle on the upper half. The indehiscent capsule is reniform. 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