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The "Oni-hikage-warabi" (Diplazium nipponicum) belongs to the family Woodsiaceae. It is an evergreen or summer-green fern that is native from Honshu to Shikoku and Kyushu, as well as Zhejiang in China. This fern grows in wettish mountain forests, and it can reach 70-120 cm in height. The rhizome is thick and creeping long. The fertile fronds are biternate to triternate compound, and about 1.3 m long. The blackish-brown to brownish-red, narrow lanceolate scales are borne at the base of petioles. The sponrangia bands are linear and arrnaged near the rachises. In Chinese, it is called "日本双盖蕨" (ri ben shuang gai jue).
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