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The presented paper focuses on the occurrence and variability of one of the most problematic cyanobacterium all over the world - Cylindrospermopsis raciborskii, which has occurred near Olomouc again after thirty years. We found the species in a small dead arm of the Morava River and collected samples of phytoplankton from summer to late autumn. We studied both living as well as preserved samples and documented variability of the species by drawings and microphotographs. The obtained data are discussed with relevant literature.

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Occurrence and morphological variability of Cylindrospermopsis raciborskii (WOLOSZ.) SEENAYYA et SUBBA RAJU (Cyanophyta, Nostocales) near Olomouc in 2006.