Some Heteronema species [Euglenophyta] occurring in Leczna-Wlodawa Lakeland [Eastern Poland]

One new Heteronema cf. distigmoides Christen and three rare taxa of H. acus (Ehrenberg) Stein, H. spirale KLEBS and H. nebulosum (Dujardin) Klebs were reported for the Polish flora. All of them were found in the mesotrophic Lake Piaseczno and in a small village pond in Kaniwola, in 2002. Both water reservoirs are situated on the Łęczna-Włodawa Lakeland (Eastern Poland). The above mentioned species are new to the flora of the Łęczna-Włodawa Lakeland, probably because of insufficient research, which was carried out on euglenophytes in this area previously. All the presented species are described thoroughly and illustrated in this paper.