なんごくならいしだ (南国奈良井羊歯) [Index] [Back] わが国の本州、東北地方南部から四国、九州の北中部、それに朝鮮半島や中国に分布しています。山地の陰湿な林下に生え、高さは３０〜６０センチになります。根茎は長く匍匐して広がります。葉は緑色から濃い緑色の五角形で、３回羽状複葉から４回羽状複葉です。最下羽片の下向き第１小羽片が発達します。小羽軸の表面には針状の毛が密生しています。胞子嚢群は大型で丸く、裂片の切れ込み近くにつきます。中国語では「毛枝蕨（mao zhi jue）」と呼ばれます。 オシダ科カナワラビ属の常緑シダ類で、学名は Arachniodes miqueliana (syn. Arachniodes fargesii)。英名はありません。 The "Nangoku-narai-shida" (Arachniodes miqueliana) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed across Japan, from the southern part of the Tohoku region on Honshu to Shikoku and the northern and central parts of Kyushu, as well as on the Korean Peninsula and in China. It grows in the shaded, damp forest understory of mountainous areas and reaches a height of 30 to 60 cm. The rhizome is long, creeping, and spreading. The leaves are pentagonal, ranging from green to dark green, and are either three- or four-pinnate. The first downward-pointing leaflet of the lowest pinna is well-developed. The surface of the rachis is densely covered with needle-like hairs. The spori are large and round, located near the notches of the lobes. It is called "毛枝蕨" (mao zhi jue) in Chinese. 大分県九重町「雨ヶ池」にて、2026年05月13日撮影。 Shu Suehiro shu@botanic.jp