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The Dojkinci River belongs to the Nature Park „Stara planina“, Eastern Serbia. The river has never been investigated by algologists. Diatom samples were collected during July 2010 on 15 localities from different types of substrate including stone surfaces, sand, mud, filamentous algae and submerged mosses. In the laboratory, samples were cleaned by standard cold acid method, and permanent slides were observed by light microscope. During the investigated period, a total of 124 taxa were determined within 43 genera. Among numerous common diatoms we recorded three taxa for the first time in Serbia: Brachysira intermedia (Øst.) Lange-Bertalot, Chamaepinnularia mediocris (Krass.) Lange-Bertalot and Navicula tridentula Krass.. Also, we observed 21 taxa which are rarely recorded taxa for Serbia. The most interesting was Diatomella balfouriana Grevill. In Serbia, it was known only from the River Tisa near Titel (Szabados 1966). In the studied material, it was identified only in samples collected from the surface of rocks at the third locality. We observed it in mass, together with Tetracyclus rupestris (Braun) Grun. Their morphology, distribution and ecology is presented in this paper. The objective of this investigation is to show that our knowledge of the diatom flora of Serbia is very poor despite the growing efforts in the immediate past. Evaluation of the floristic richness of diatoms in the river is a necessary, further step. These new information increases our knowledge of the river system, which is important for further prediction of diatoms as bioindicators, and monitoring programs.

The main objective of this paper is to report benthic, epilithic diatom species from the Raška River. First time Husted described Navicula jakovljevicii in 1945. This taxon has been found outside the Balkan area for the first time, in the Lake Zug, Switzerland. Until now, there is no published data about diatom flora in Raška River. In the present study, we sampled benthic diatoms to evaluate the floristic richness of the river.

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. 11th Symposium of the Flora of Southeastern Serbia and Neighboring Regions, Vlasina, Serbia, 13.06.2013

Rad sadrži podatke o sastavu epifitskih silikatnih algi roda Navicula (sensu stricto i sensu lato) sa lokaliteta Suvi Do (Pešterska visoravan, Srbija). Uzorci su sakupljani u julu i septembru 2008. godine i u maju 2009. godine ceđenjem mahovina Calliergon giganteum [(Schimp.) Kindb.], kao i struganjem epifita sa površine mahovina. U laboratoriji algološki uzorci su tretirani standardnom metodom sa koncentrovanom sumpornom kiselinom i kalijum permanganatom, a potom su napravljeni trajni preparati silikatnih algi. Pregledom preparata identifikovano je 14 taksona epifitskih silikatnih algi roda Navicula. U okviru roda Navicula sensu stricto identifikovano je 8 taksona. Analize su pokazale i prisustvo taksona iz rodova Placoneis, Cavinula i Sellaphora (rodovi u okviru Navicula sensu lato). Ovo su prvi podaci o rasprostranjenju silikatnih algi na Pešterskoj visoravni. Rezultati ovog rada uključuju i 4 nova taksona za floru silikatnih algi Srbije. The paper includes data for the composition of epiphytic diatoms of the genus Navicula (sensu stricto and sensu lato) from the site Suvi Do (Pester plateau, Serbian). Samples were collected in July and September 2008. year and in May 2009. squeezing the moss Calliergon giganteum [(Schimp.) Kindb.], and epiphytes by scraping the surface of moss. In the laboratory, samples were treated in standard method with concentrated sulfuric acid and potassium permanganate, and then were made permanent preparations of diatoms. A review of preparations identified 14 taxa of epiphytic diatoms genus Navicula. Within the genus Navicula sensu stricto 8 taxa were identified. Analysis showed the presence of taxa of the genera Placoneis, Cavinula and Sellaphora (in the genera Navicula sensu lato). These are the first data on the distribution of diatoms in the Pester plateau. The results of this study include 4 new taxa for diatoms flora of Serbia. Perućac, Serbia, 04-06.06.2013

The aim of this paper is to present the distribution of Decussata hexagona, a new species in diatom flora of Serbia. Seventy-two diatom samples were collected from six localities along the Vrla and Rasina Rivers during 2011 and 2012. Decussata hexagona was recorded with single specimens or low relative abundance (0.3%) from epilithic communities in seven samples from the Vrla River and in one sample from the Rasina River. It was recorded in unusual epilithic habitats of running neutral to low-alkaline waters with low ion content.