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The "Kijino-o-shida" (Plagiogyria japonica) belongs to the family Plagiogyriaceae. It is an evergreen fern that is distributed from the southern Tohoku region of Honshu south to Shikoku and Kyushu in Japan, as well as Taiwan, the Korean Peninsula, and China. It grows under forests in mountainous areas and is 40 to 80 cm tall. It has dimorphic leaves. The sterile fronds are dark green, glossy, and softly leathery. The pinnae are sessile and not curved into a sickle shape. The pinnae of the fertile frond are linear and stipitate. It also bears a long sorus along the midrib of pinnae, which withers when ripe. The Japanese name comes from the leaf shape, which resembles a pheasant's tail. In Taiwanese Chinese, it is called "華東瘤足蕨" and "華東瘤足蕨" (hua dong liu zu jue) in Chinese.
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