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Live specimens of Fallacia helensis (Schulz) D.G. Mann were recorded in the silt of a plant settling tank that purifies water (ground and surface) drained from a brown coal mine. In Poland the species had previously been identified only in fossil material from the Pleistocene and Holocene (Marciniak 1973, Marciniak & Przybyłowska-Lange 1977). Morphometric data and an ecological analysis, including data on associated diatom species, are presented.
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