ふくろしだ (袋羊歯) [Index] [Back] わが国の各地をはじめ、朝鮮半島や中国の北部から東北部、アムール、ウスリーに分布しています。山地の岩上や岸壁などに生え、高さは１０〜２０センチになります。葉は狭い披針形で２回羽状深裂し、長さは５〜３０センチです。葉質は薄い草質で淡い緑色、裏面は白味を帯び、表裏ともに平滑で無毛です。ソーラスは羽片の辺縁寄りにつき、包膜は球形嚢状です。和名は、胞子を包む「包膜」の形が袋状になっていることに由来します。中国語では「膀胱蕨（pang guang jue）」と呼ばれます。 イワデンダ科イワデンダ属の夏緑性シダで、学名は Woodsia manchuriensis (syn. Protowoodsia manchuriensis)。英名は Manchurian woodsia。 The Manchurian woodsia (Woodsia manchuriensis) belongs to the family Woodsiaceae. It is a summer-green fern that is distributed throughout various regions of Japan, as well as the Korean Peninsula, northern to northeastern China, Amur, and Ussuri. It grows on rocky mountain slopes and cliffs, reaching a height of 10 to 20 cm. The leaves are narrowly lanceolate, twice pinnately deeply lobed, and 5 to 30 cm long. The leaf texture is thin and herbaceous, pale green in color. The underside has a whitish tinge, and both surfaces are smooth and hairless. The sori are located near the margins of the pinnae, and the indusia are spherical sac-like. The Japanese name derives from the shape of the "spore coat" that encloses the spores, which resembles a bag. In Chinese, it is called "膀胱蕨" (pang guang jue). 栃木県日光市「日光植物園」にて、2025年09月04日撮影。 Shu Suehiro shu@botanic.jp