Abstract
SUMMARYFive strains of Drouetiella (ACKU666, 667, 668, 669 and 670) were isolated from gravels in water, stone monument and coastal mudflat in Korea, and were studied using morphological and molecular traits. All five strains had thin and simple trichomes and exhibited false branching. From these strains, four strains (ACKU666, 667, 668 and 669) exhibited similar cell lengths with reddish–brown colored cells such as Drouetiella lurida. The 16S rRNA gene phylogeny showed the four strains formed a clade with Drouetiella lurida, and their DNA similarity was calculated to be 99.1–100%. The color of strain ACKU670 appeared to be in bright blue–green color like Drouetiella fasciculata, and their thylakoids showed a parietal arrangement, which is a characteristic feature of the family Oculatellaceae. Strain ACKU670 turned out to be a sister clade to the D. lurida according to the phylogenetic analysis of the 16S rRNA gene. The 16–23S rRNA internal transcribed spacer secondary folding structure (D1–D1′, Box‐B and V3 helices) confirmed the uniqueness of strain ACKU670, therefore indicating differences from the related species. Considering all the results, we described our strain ACKU670 as Drouetiella epilithica sp. nov. in accordance with the International Code of Nomenclature for Algae, Fungi and Plants.
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