THE fern genus Onychium Kaulf. is primarily an old-world representative of Bower's1 primitive gymnogrammoids. Excepting Bower1 and Holttum2, there is a general agreement in the pteroid affinity of the genus; but its exact phyletic treatment, however, differs considerably in the various systems of classifications1–5.
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MEHRA, P., VERMA, S. Cytology of Indian Species of Onychium . Nature 180, 715–716 (1957). https://doi.org/10.1038/180715a0
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