むにんおにやぶそてつ (無人鬼藪蘇鉄) [Index] [Back] わが国の四国、高知県、九州の長崎県および鹿児島県、沖縄県、小笠原諸島それに台湾の蘭嶼島に分布しています。おもに海岸近くの林床や林縁に生え、高さは４０～８０センチになります。葉は単羽状複葉で暗緑色、光沢があり、薄い革質です。葉柄は淡緑色で、黄褐色の鱗片がつきます。ソーラスは羽片全面に散在し円形、包膜は灰白色で中央部は黒褐色または灰白色です。和名の「むにん（無人）」は産地の小笠原諸島に因み、古くは「無人列島」と呼ばれていたからです。台湾華語では「濱海全縁貫眾蕨」と呼ばれます。 オシダ科ヤブソテツ属の常緑性シダ類で、学名は Cyrtomium falcatum ssp. australe。英名はありません。 The "Munin-oni-yabu-sotetsu" (Cyrtomium falcatum ssp. australe) belongs to the family Dryopteridaceae. It is an evergreen fern that is distributed to Kochi Prefecture in Shikoku, Nagasaki and Kagoshima Prefectures in Kyushu, Okinawa Prefecture, the Ogasawara Islands, and Lanyu Island in Taiwan. It mainly grows in the forest floor or at the edge of forests near the coast, and is 40 to 80 cm tall. The leaves are pinnate compound that are dark green, shiny, and thinly leathery. The leaf stalk is light green and has yellowish-brown scales. The sorus is scattered all over the pinna and is round, and the indisum is grayish white with a blackish brown or grayish white center. The Japanese name "muni" (meaning "uninhabited") is derived from the Ogasawara Islands where it is found, which were once called "the uninhabited archipelago". In Taiwanese, it is called "濱海全縁貫眾蕨". 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