Fern constituents. Onoceroid,.ALPHA.-onoceradiene,serratene and onoceranoxide,isolated from Lemmaphyllum microphyllum varieties.

Abstract

α-Onoceradiene (I) and serratene (IV) were isolated and identified from a Polypodiaceous fern, Lemmaphyllum microphyllum var. microphyllum, while a new compound, onoceranoxide (VII), was obtained from var. obovatum as a main triterpenoid and its structure was established.