おりづるしだ (折鶴羊歯) [Index] [Back] わが国の本州、関東地方以西から四国・九州、それに台湾や朝鮮半島、中国の南東部に分布しています。山地の林下、とくに海岸近くに生え、高さは３０〜７０センチになります。葉は単羽状複葉で灰緑色、光沢はなく、硬い紙質です。葉柄基部には茶褐色の鱗片がつきます。ソーラスは羽片中肋の両側に２列平行に並び、包膜は小さな円形です。和名は、葉の中軸が伸びて、先端に無性芽をつけるさまを、糸につるした折り紙の鶴に見立てたもの。台湾華語では「鞭葉耳蕨」、中国語では「鞭葉耳蕨（bian ye er jue）」と呼ばれます。 オシダ科イノデ属の常緑性シダ類で、学名は Polystichum lepidocaulon。英名はありません。 The "Orizuru-shida" (Polystichum lepidocaulon) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed from the Kanto region of Honshu and westwards to Shikoku, Kyushu in Japan, as well as Taiwan, the Korean Peninsula and south-eastern China. It grows in mountain forests, especially near the coast, and is 30-70 cm tall. The leaves are pinnate compound, grayish green, without a sheen, and have a hard papery texture. The leaf stalk base has brownish-red scales. The sorus is arranged in two parallel rows on both sides of the midrib of the frond, and the indisum is small and round. The Japanese name for this plant is based on the appearance of the rachis of the leaf, which extends and bears an apical unisexual bud, resembling a paper crane hanging from a string. In Taiwanese, it is called "鞭葉耳蕨", and in Chinese it is called "鞭葉耳蕨" (fan ye er 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