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. 2023 Jan 9;13:426. doi: 10.1038/s41598-022-27334-0

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© The Author(s) 2023

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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Nanjinganthus dendrostyla and its ovules within the ovary. PB180516. All scale bars = 1 mm, except annotated. (a) Several coalified compressions embedded in siltstone. Scale bar = 1 cm. (b–e) Virtual cross sections, in an ascending order, of the ovary of a flower fully embedded (invisible, in the rectangle in a) in the specimen shown in (a). (f,g) Two virtual vertical sections of the flower shown in (b–e), showing an ovary with an ovary roof (triangles) and petals (p). (h) A detailed view of the rectangular region in (f), showing a funipendulous ovule (o) attached to the inner wall of the ovary that has a roof (triangles) and petals (p). To make it easy to observe, the figure is vertically stretched by 700%.