Onychium is a genus of ferns in the subfamily Pteridoideae of the family Pteridaceae.
Phylogeny , the Checklist of Ferns and Lycophytes of the World recognized the following species and hybrids: Nitta et al. 2022 and Fern Tree of life Other species include:O. divaricatum (Poir.) Alston O. kholianum Fraser-Jenk. & S.Matsumoto O. ×matsumotoi Fraser-Jenk. & Kandel O. vermae Fraser-Jenk. & Khullar
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