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. 2016 May 20;7:678. doi: 10.3389/fpls.2016.00678

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Copyright © 2016 Holzinger and Pichrtová.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Pre-akinete formation in Zygnema sp. Saalach. (A) 1 month, (B) 6 months, (C) 9 months, (D) 15 months old cultures. Arrows: pyrenoids, asterisks: nuclei, arrowheads: thickened cell walls. Bars 10 μm. Reprinted from Herburger et al. (2015).