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The Felt fern (Pyrrosia hastata) belongs to the family Polypodiaceae. It is an evergreen perennial fern that is distributed throughout Japan, as well as the Korean Peninsula. It grows on tree trunks and rocks in mountainous areas. The rhizome is creeping, and the long petiole ends in a spear-shaped leaf blade. The sori are found all over the underside of the leaf. The Japanese name is derived from the leaf shape, which resembles that of the "Arrowhead" (Sagittaria trifolia) that grows in marshy areas. The Chinese name is "戟葉石韋" (ji ye shi wei).
In Korean, it's called "se-ppul-seok-wi" (세뿔석위). This is a compound word consisting of "three" (se: 세) + "horn" (ppul: 뿔) + "Tongue fern" (seok-wi: 석위). The plant is named for its leaves, which are divided into three spear-shaped lobes that resemble three horns.
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