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. 2015 Feb 26;15:28. doi: 10.1186/s12862-015-0292-6

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© Wang and Liu; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Yiduxylon trilobum gen. et sp. nov. from Hubeiv. (a-b) Successive transverse sections of a stem bearing a petiole base. Stem with three-ribbed primary xylem, secondary xylem and cortex. Sparganum-type outer cortex in (a). (b) Petiole base with vascular bundles, ground tissue and sparganum-type outer cortex. Arrow indicating part enlarged in (e). Slides 4–1 and 4–6. (c-d) Enlargement of (a) and (b), respectively. (e) Enlargement of (b, arrow) showing two vascular bundles in oblique longitudinal view. (f) Enlargement of lower left part of (b) showing two vascular bundles in oblique transverse view. Arrows indicating protoxylem strands. Scale bars = 1 mm (c), 0.2 mm (e), 0.5 mm (f).