Ultrastructure of leaf mesophyll and two-layer trap wall of Utricularia vul
garis L. was studied after 24-h and 48-h treatment with different concentra
tions of cadmium. The treatment of plants with 0.25 g(Cd2+) m(-3) caused di
fferent changes in the chloroplasts of the two organs. The thylakoids swell
ed in chloroplasts of leaf and the starch content increased in chloroplasts
of traps. Higher concentrations of Cd (0.5 and 1.5 g m(-3)) caused osmioph
ilisation of thylakoids in the chloroplasts of both studied organs. The sec
retory cells in the trap wall was resistant to Cd.