The article summarizes the results of a study on terrestrial algae of Cape Kazantip, conducted during summer 2012 on the territory of the Kazantip Nature Reserve and its environs. Samples of biological soil crusts from the coquina beach and clay scree, as well as lithophytic algal communities, were studied by direct light microscopy with subsequent culturing. For a number of strains of cyanobacteria and eukaryotic algae, phylogenetic analyses based on the nucleotide sequence of the 16S/18S rRNA gene, as well as the 16S-23S ITS region/ITS-1,2 were performed. These data clarified species identity and taxonomic position, as well as to make a number of interesting floristic records, supplementing the algal flora of Ukraine with new taxa of the genera Oculatella Zammit, Billi et Albertano, Timaviella Sciuto et Moro, Roholtiella Bohunická, Pietrasiak et Johansen, Bracteacoccus Tereg, Interfilum Chodat. In total 73 species were identified from the divisions of Cyanoprokaryota (35), Chlorophyta (23), Streptophyta (5), Ochrophyta (10). Litophyton and soil crusts differed markedly in species diversity, taxonomic structure and the dominant algal complex. Only 30.1% of the identified species were found in both types of habitats, while 41 species occurred in rock communities. Here, a high diversity of cyanobacteria, especially representatives of the order Nostocales and Chroococcales, as well as Trebouxiophyceae and Ulvophyceae among green algae, were recorded. On limestone, in the chasmoendolitic communities dominant species were G. punctata Nägeli and Ctenocladus circinnatus Borzi while on the rock surface Desmococcus olivaceus (Pers. ex Ach.) J.R. Laundon and Trentepohlia sp. dominated. In the hypolithic communities on quartz, filamentous cyanobacteria prevailed. In biological crusts on the conquina and clay, 54 species were identified. Cyanobacteria were leading both in the number of species (42.6% of the total diversity) and abundance. Species of genera Microcoleus Desmazières ex Gomont, Coleofasciculus Siegesmund, Johansen et Friedl, Hassallia Berkeley ex Bornet et Flahault, Nostoc Vaucher ex Bornet et Flahault, Scytonema Agardh ex Bornet et Flahault and some others dominated in the crusts studied. Chlorophyta (33.3%), among which the proportion of representatives of the class Chlorophyceae increased markedly, were the second in species diversity, but their abundance was low. Only once Klebsormidium mucosum (J.B. Petersen) Lokhorst (Streptophyta) dominated in a crust on the clay scree. Crusts from the conquina had wider representativeness of cyanobacteria and algae (45 species, an average of 13.5 species per sample) as compared with clay screes (24/9.6). Among species discovered in the present study only 13.7% were previously cited for this territory.
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