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. 2020 May 26;10:8679. doi: 10.1038/s41598-020-64774-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Morphology and morphometry of Microcoleus asticus sp. nov.: (a) mat in culture conditions (scale bar 1 cm); (b) filaments in low magnification; (c) entangled filaments; (d) surrounding sheath in phase contrast; (e) heteropolar filament; (f) variation in end cell morphology in straight filaments: 1 – truncated, 2 – conical, 3 – broadly rounded; (g) tapered filament, note a reduction of 64% in cell width towards the end between the two arrows, the lines represents the cell morphometric measurements, x - length, y – width; (h) tapered filament with a calyptra (arrow); (i,j) filaments with spherical and square hyaline membranous structures (arrows); (k) distribution density of the cells widths and lengths, the white dot indicates the median and the black bar represents the interquartile range, the black line represents the 95% confidence intervals after 500 measurements. Scale bars 10 µm.