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Anabaena poulseniana J. Boye Petersen Bot. Iceland 2, 1923 (Cyanobacteria), a cyanobacteria species new to Polish flora, was noted during a study of phytoplankton in one of Wrocław’s clay pits. The species was noted in plankton samples among Cylindrospermopsis raciborskii (Wołoszyńska) Seenayya et Subba Raju (Cyanobacteria) and Mougeotia sp. (Chlorophyta) filaments. The green algae created a bloom characterized by vegetation mats floating on the water. The paper presents detailed characteristics for Anabaena poulseniana, and for the habitat and the ecological condition in the examined water reservoir during its presence. The paper also presents a comparison of morphological characteristics of A. poulseniana from Poland to the species from other geographical locations. The research will provide data on the morphology and ecology of the species. The species found during the study were documented in the form of original photos and illustrations.

Anabaena poulseniana J. Boye Petersen — a species new to Polish flora