Abstract
Abstract - In the cryoseston community of the Pirin Mountains, 18 species were determined. Chlorophyta: Chlamydomonas nivalis (predominant), Chloromonas brevispina, Chloromonas rostafinski, Chlainomonas rubra (new genus and species for Bulgaria, documented in Europe for only the second time), Cystococcus nivicolus and Stichococcus nivalis. Bacillariophyceae: Aulacoseira granulata var. angustissima, Hantzchia amphioxys, cf. Surirella. Fungi: cf. Chytridium chlamydococcii. Deuteromycetes: Selenotila nivalis, Chionaster nivalis, and saprophytic fungae cf. Myzocytium, Rhodosporidium toruloides, Alternaria sp. and cf. Cladosporium, in pollen grains. Bacteria: Leptothrix ochracea. Ciliata: Vorticella campanula. The composition of cryoseston in the Pirin Mountains is characteristic for high mountains where Chlamydomonas nivalis predominates.
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