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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, the Korean Peninsula, and China. 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).
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