The newly recorded species, Diplazium mettenianum (Miq.) C. Chr. var. mettenianum (Athyriaceae) was collected from a forest in Min-oreum, Jeju-do. D. mettenianum var. mettenianum (vernacular name: ‘Kit-ju-reum-go-sa-ri’) is distinguished from other Korean congeners of the genus Diplazium by having pinnae shallowly or halfway lobed, lower pinnae stalked, lanceolate, pinna segments serrate margin and obtuse apex. A new Korean name, ‘Kit-ju-reum-go-sa-ri’, was given based on the shape of pinna halfway lobed. Descriptions and illustrations of this taxon and its photograph in the habitat are provided along with a key to the species of Diplazium from Korea.
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