The results of investigation of algae from granite outcrops of river valleys located in three climatic zones of Ukraine – Polesye (Teteriv River), Forest-Steppe (Ros River) and Steppe (Yuzhnyi Bug River) are presented. 179 algal species were found (8 new species for Ukrainian flora), among them green (mostly trebouxiophycean) and streptophyte algae are led. Green conjugating algae are distributed on outcrops of Polesye as well; cyanoprokaryotes and diatoms are numerous on outcrops of Forest-steppe zone; cyanoprokaryotes are characteristic for outcrops of Steppe zone. Dominant complex included common for all granite outcrops genera Elliptochloris Tscherm.-Woess, Apatococcus F. Brand emend. Geitler, Desmococcus F. Brand emend. Vischer, Klebsormidium P.C. Silva et al. etc. Specificity of dominant species of outcrops of Teteriv River (Polesye) are determined by Trentepohlia E. Martini and Mesotaenium Nägeli, Ros River (Steppe zone) – Chlorogloea Wille, Gloeocapsa Kütz., Prasiolopsis Vischer etc., Yuzhnyi Bug River (Forest-Steppe zone) – Trentepohlia, Chlorogloea, Dilabifilum Tscherm.-Woess, etc. Two ecological groups of algae – epilithic and chasmoendolithic, are presented on granite outcrops of all investigated outcrops: epiliths are occurred in shaded places and near the water, chasmoendoliths were found on dry lighted slopes, but sometimes occurred in shade also. Species composition and dominant complex of algae from granite outcrops depend on conditions of particular habitat as well as on climatic zone. Comparison of data about algae from granite outcrops with other stone substrates of Ukraine shows that species composition is relatively similar on substrates with close chemical peculiarities, but physical characters perhaps less influence on algae.
Keywords: terrestrial algae, granite outcrops, river volleys, climatic zones, Teteriv River, Ros River, Yuzhnyi Bug River, Ukraine
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