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The Squirrel's foot fern (Davallia mariesii) belongs to the family Davalliaceae. It is a summer-green fern that is distributed from southern Hokkaido to Honshu, Shikoku and Kyushu of Japan, as well as the southern Korean peninsula, China and Taiwan. It grows on rocks and trunks along mountain swamps, and can reach a height of 15 to 30 cm. The leaves are tri- or tetra-pinnate compound, and the overall shape is triangular ovate. The sori are wrapped in the indusia and attached to each lobes to form a cup. In Japan, it has been cultivated for a long time, and in particular, a palm ball is called a "Shinobu-dama", which is made by palm fibers into a round shape, crawling Squirrel's foot fern, and hanging it with a string.
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