throughout the development of scrolls (unrolled young leaves) Seasonal distribution of total lipids, of total and individual to vegetatively mature leaves. The maximum concentration of phospholipids as well as of one betaine lipid, diacylglyceryl-DGTS for all the examined species was found in scrolls. N,N,N-trimethylhomoserine (DGTS), found in the leaves of Dryopteris carthusiana, Dryopteris filix-mas, MatteucciaDGTS then decreased to its minimum level or entirely disapstruthiopteris and Pteridium aquilinum was studied. Using peared to reappear at later stages of leaf development. This may indicate a specific role of DGTS in the plant membrane. thin-layer chromatography it was shown that lipid composition was different in these species and changed substantially