Discovery of Lepisorus hachijoensis (Polypodiaceae) misidentified as Lepisorus onoei on Gageodo Island, Korea

While preparing for a floristic study of Gageodo Island, we discovered the following unrecorded species: Lepisorus hachijoensis (Polypodiaceae). It is known to be distributed only on Hachijo Island of Japan, which was the collection site of the type specimen. However, on the basis of the findings of the Fifth National Natural Environment Survey, it has recently been established that this plant also grows on the bark of trees and on shaded rocks along ridges on Gageodo Island, Sinan-gun, Jeollanam-do, in Korea. In this study, we present a description and photographs and indicate differences between Korean L. hachijoensis and related species as well as a key to the related taxa.