A NEW LOCALITY OF THE FRESHWATER POPULATION OF Ulva flexuosa subsp. pilifera (Chlorophyta, Ulvophyceae) IN POZNAŃ (WIELKOPOLSKA)

In the latter part of the April of 2011 green algae thalli from the genus Ulva were found at the new, until now not known site in the Wielkopolska region. Thalli of Ulva (syn. Enteromorpha) flexuosa subsp. pilifera (Kützing) Bliding 1963 were collected to a further morphological research from the small, nameless, artificial dam reservoir located in the north part of Poznań. It was the second site, after the Malta Lake, of its taxon in Poznań and the sixth site in Poland. At the newly described site of Ulva flexuosa subsp. pilifera located near the west shore of the reservoir free-floating thalli were appeared in the sparseness (5-10 ind./m2). Moreover, individual thalli of Ulva strongly were covered by filamentous algae which formed dense mats on the water surface. Thalli of Ulva at the new site were observed from the end of April until the end of May of 2011.TEKA KOM. KSZT. ŚROD. PRZYR.-OL PA