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The Holly fern woodsia (Woodsia polystichoides) belongs to the family Woodsiaceae. It is a summer-green fern that is widely distributed throughout Japan, as well as in Taiwan, the Korean Peninsula, China, and the Russian Far East. This fern grows in wet rocky places on low mountains, and can reach 10-30 cm in height. The leaves are unipennate, narrowly lanceolate and white hairy on both surfaces. The pinnae are deltoid-oblong, 15-24 pairs and eared upwards at the base. The sori are round and arranged in one row near the margin. In Taiwanese Chinese, it is called "岩蕨", and "耳羽岩蕨" (er yu yan jue) in Chinese.
In Korean, it's called "u-deu-pul" (우드풀). This is a compound word consisting of "Woodsia" (u-deu: 우드) + "grass" (pul: 풀). The name "u-deu" is derived from the genus name "Woodsia".
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