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. 2015 Sep 10;6:730. doi: 10.3389/fpls.2015.00730

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Copyright © 2015 Gričar, Prislan, de Luis, Gryc, Hacurová, Vavrčík and Čufar.

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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Structure of xylem and phloem rings in Picea abies. Vertical bars denote widths of PR, phloem ring; EP, early phloem; LP, late phloem; CZ, dormant cambium; XR, xylem ring; EW, earlywood; and LW, latewood; scale bar = 100 μm.