Uranium accumulation in the lichen Cladonia rangiferina. Part II. Toxic effects of cationic, neutral, and anionic forms of the uranyl ion

The toxicity of the uranyl ion to the lichen Cladonia rangiferina (L.) Wigg. was shown to be strongly dependent on chemical speciation. Photosynthetic measurements indicated that the anionic complex of oxalate [Formula: see text] was more toxic than the uncomplexed cation [Formula: see text]. No detrimental response could be assigned to the neutral phthalate complex (UO 2