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. 2021 Jun 8;11:12053. doi: 10.1038/s41598-021-90938-5

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Anatomy of cork plank (outer bark) from Quercus suber. (a) Cork freshly-harvested at the late spring (June) in Romanyà de la Selva (Girona, Spain) showing this year produced living tissue (white arrowhead) in the innercork side, which faces the phellogen (black arrow). (b) A dried and polished sample is shown to better appreciate the annual cork-rings seen as lighter (earlycork) and darker brown (latecork) zones. Lenticels are highlighted with a black arrowhead. The grid scale distance in B corresponds to 1 cm. The figure was constructed using the free and open source Inkscape software 1.0 (https://inkscape.org/).