みやまくまわらび (深山熊蕨) [Index] [Back] わが国の本州から四国・九州それに朝鮮半島南部に分布しています。山地の林床に希に生え、高さは５０〜８０センチになります。葉は２回羽状複葉で緑色から濃緑色で、光沢はなく、硬い紙質です。葉柄基部には、やや光沢のある黒色から黒褐色の鱗片が密生します。ソーラスは葉身の上部だけについて、裂片の辺縁寄りに１列に並びます。包膜は円腎形で、全縁です。 オシダ科オシダ属の常緑性シダ類で、学名は Dryopteris polylepis。英名はありません。 The "Miyama-kuma-warabi" (Dryopteris polylepis) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed from Honshu to Shikoku and Kyushu in Japan, as well as in the southern part of the Korean Peninsula. It grows rarely in the forest floor of mountains, and is 50 to 80 cm tall. The leaves are bipinnate compound, green to dark green in color, and have a hard, papery texture with no luster. The leaf stalk base is densely covered with slightly shiny black to blackish brown scales. The sorus is only found on the upper part of the leaf blade, and is arranged in a single row near the edge of the lobes. The indusium is reniform in shape and has an entire margin. 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