Among 226 taxa 50 were determined as dominant. The most important were Achnanthes lanceolata (Bréb.) Grun., Meridion circulare var. constrictum (Ralfs) V.H., Navicula radiosa Kütz., and Fragilaria ulna (Nitzsch) L.-B., best developed on the silt and sand. Macroscopic conglomerations were sporadic and most frequently covered less than 10% of the bottom, except for Tribonema viride Pascher (at the source), and T. vulgare Pascher and Chaetophora elegans (Roth.) Ag. (only in pools). Litorheophilous, pelorheophilous, and pelophilous communities were dominant, particularly near the source.