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"Ouren-shida" (Dennstaedtia wilfordii) belongs to Dennstaediaceae (the Bracken family). It is a perennial fern that is distributed throughout Japan, as well as the Korean Peninsula, China and northern India. It grows along streams and on slopes in cool mountainous areas and is often found in limestone areas, growing 30-70 cm tall. Rhizomes creep long underground. The leaves are irregular, 2-3 times pinnate, and glossy. The lower part of the petiole is blackish brown to reddish brown. The sorus are formed on the leaf margins and the indusium is cup-shaped. In Chinese, it is called "溪洞碗蕨" (xi dong wan jue).
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