Utricularia is a genus of carnivorous plants that capture a wide range of aquatic organisms. Most of these plants grow in environments with nutrients deficiency and have the ability to change the conditions of their microenvironment. The aim of this research was to study the selectivity in the
Lanthanum nitrate and uranyl acetate were used as opaque tracers in electron microscopy to demonstrate an apoplastic pathway within external and internal glands in the trap of the bladderwortUtricularia monanthos. Deposits of the tracers occurred in the cell walls but not in the protoplasts of