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J. A. Inamdar and J. J. Shah, “Occurrente of<I> Ophioglossum nudicaule</I> L.f. and <I>O.nudicaule </I>Var. Macrorrhizum (Kze.) Clausen in Dharampur Forest”, Indian Forester, vol. 93, no. 2, pp. 95–97, Feb. 1967.