Members of the liverwort genus Cheilolejeunea, on the basis of chemical data, have been divided into striatane- (I), trifarane- (II) and δ-lactone- (III) chemotypes. In this paper the sesquiterpenoids occurring in C. ceylanica from Thailand are described and the chemosystematics of Cheilolejeunea species are explored. Species belonging to type I produce striatane-type sesquiterpenoids, which have been found in many species of Lejeuneaceae and thus are considered to be one of the significant chemical markers of this family. However, to the best of our knowledge, the trifarane-type is not detected in any other liverworts. The lactone-type species produce chiroptical δ-lactones, with a milky odor.
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