Vaucheria species from selected regions in Poland

Observations on morphological features, distribution and environmental preferences of ten species of the Vaucheria genus are presented on the basis of research carried out between 1989 and 1995 at 42 localities in central Poland, the Opole Silesia, as well as individual sites in Poland. New taxa may be distinguished on the basis of observations of the more comprehensive variability of taxonomic features. Seasonal preferences and habitat conditions that influence the development of sexual organs, which are the basis of taxonomy of this genus, were determined. The following species occurred frequently in the material collected: V. sessilis, V. terrestris, V. geminata, V. hamata. On the other hand: V. dichotoma, V. verticillata, V. aversa, V. undulata, V. walzi, V. woroniniana, were found sporadically throughout the observations