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The glaucous epicuticular layer on the undersurface of the leaves of Polypodium glaucinum and the white exudate material on the lower surface of the sterile pinnae of Plagiogyra formosana is shown, mainly by spectroscopical methods, to consist of a mixture of 9(ll)-femene and 21-epi-9(l l)-femene, in both instances in a ratio of ca. 4:1. The 13C-NMR spectrum of 9(ll)-femene has been re­ corded and partially assigned.

9(11)-Fernene and Its 21-Epimer as an Epicuticular Layer on Ferns