New or rarely recorded diatoms taxa from Serbia (Dojkinačka stream, SE Serbia)

Abstract

Diatoms (Bacillariophyta) inhabiting different types of substrate including stone surfaces, sand, mud, filamentous algae and submerged mosses in the Dojkinačka stream (SE Serbia) were studied by light microscopy. Among numerous common diatoms taxa we observed 17 rarely recorded taxa from Serbia and 5 new to the Serbian diatom flora (Brachysira intermedia (Øst.) Lange-Bert., Chamaepinnularia mediocris (Krass.) Lange-Bert., Navicula tridentula Krass., Eunotia paludosa Grun., Eunotia boreoalpina Lange-Bert. & Nörpel-Schem.). Among rare taxa, the most interesting was Diatomella balfouriana Grevill. In Serbia, it was known only from the River Tisa near Titel (Szabados 1966). In the material studied, it was identified only in samples collected from the surface of rocks at the third locality in unpolluted section of the Dojkinačka stream. We observed it in mass, together with Tetracyclus rupestris (Braun) Grun.