New find of the rare and endangered species Bangia atropurpurea (Roth) C. Agardh (Rhodophyta) in Serbia

Data about distribution of Bangia atropurpurea (Roth) C. Agardh indicate that this species was found on relatively small number of localities in freshwaters in Europe and world. In Red List of Algae, in some countries, this species is defined as a extinct (Ex) (Poland) or as endangered (En) (Slovakia). In this study, morphological and ecological characteristics of rare and endangered species B. atropurpurea that was found on three localities in Serbia: in Trgovi ki Timok River (East Serbia), Gvozda ka Reka River (West Serbia) and Ra ka River (South-western Serbia). The Ra ka River is new find of the species B. atropurpurea.