METHYLENE BISFLAVONOIDS FROM FROND EXUDATE OF PENTAGRAMMA-TRIANGULARIS SSP TRIANGULARIS

Fronds of a distinct chemotype of Pentagramma triangularis ssp. triang ularis produce an exudate from which two novel flavonoids have been is olated. Common to both substances is a kaempferol-4'-methyl ether moie ty bearing a C-8 methylene to which is attached in one instance a seco nd kaempferol-4'-methyl ether moiety through the 8 position and in the other instance a dihydrochalcone moiety through the 3' position. The structural assignments were made by means of spectral data and X-ray c rystallographic analysis.