Abstract
The soil algal species composition of some marlstone-substratum based biotopes of Džban region (Central Bohemia, Czech Republic) was investigated. A total of 54 species representing 42 genera were recovered. Chlorophytes were the most abundant group in all investigated sites. The most common green algal species encountered were Mychonastes homosphaera, Stichococcus bacillaris and Klebsormidium flaccidum. Other frequently occuring species were the cyanophytes Nostoc commune and Phormidium autumnale f. autumnale and diatoms Pinnularia borealis and Nitzschia palea. The investigated sites were compared according to their soil algal floras, The natural treeless localities share similar soil algal synusiae with some typical non-forest features - higher frequency of filamentous cyanophytes and diatomes, occurrence of some desmids. The species list from an investigated secondary meadow is dominated by chlorococcal algae with lower occurrence of other groups. This could be determined by lower pH of the soil from this locality The beech dominated forest locality shares some features typical for temperate forests - lower species richness, common occurrence of green flagellates and unicells, low occurrence of cyanophytes.
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