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High concentrations of heavy metals have been reported from different en vironmental sources and these heavy metals might exert detrimental effects on the associated vegetations (Turner 1969, Wong et al. 1978). Algae, which are one of the most common groups of plants found in various environments, therefore suffer from the toxic actions of heavy metals (Whitton 1970a, 1970b, Malanchuk and Gruendling 1973, Bartlett et al. 1974, Klass et al. 1974, Burnison et al. 1975, Over nell 1975a, 1975b, Silverberg 1976). On the other hand, heavy metal-tolerant popu lations of various plant species have been reported (Turner 1969, Antonovics et al. 1971). In algae, it has been found that certain populations of Stigeoclonium tenue

Ultrastructural changes in Spirogyra submargaritata growing on iron-ore tailing.