New European locality of three rare taxa (Zygnematophyceae, Streptophyta): Cosmarium pseudoprotuberans var. sulcatum (Nordstedt) Coesel, Gonatozygon aculeatum W.N.Hastings and Pleurotaenium simplicissimum Grönblad

In the current article new Ukrainian desmid material: three species for Ukraine and their location are examined. The discussion focuses on comparing newly found in to previous published descriptions Europe. reported distribution of these taxa Europe: Cosmarium pseudoprotuberans var. sulcatum (Nordstedt) Coesel was five countries, Gonatozygon aculeatum W.N.Hastings eight countries Pleurotaenium simplicissimum Grönblad previously revealed only four European countries. We provide a detailed description morphological characters cells supply it with drawings pictures. ecological aspects habitat important flora desmids discussed. This provides information better understanding ecology correct identification described rare sometimes poorly known species.