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. 2019 Oct 23;574(7780):679–685. doi: 10.1038/s41586-019-1693-2

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© The Author(s) 2019

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

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Fig. 1 — a–e, Green algae. a, Acetabularia sp. (Ulvophyceae). b, Stephanosphaera pluvialis (Chlorophyceae). c, Botryococcus sp. (Trebouxiophyceae). d, Chara sp. (Charophyceae). e, ‘Spirotaenia’ sp. (taxonomy under review) (Zygnematophyceae). f–p, Land plants. f, Notothylas orbicularis (Anthocerotophyta (hornwort)). g, Conocephalum conicum (Marchantiophyta (thalloid liverwort)). h, Sphagnum sp. (Bryophyta (moss)). i, Dendrolycopodium obscurum (Lycopodiophyta (club moss)). j, Equisetum telmateia (Polypodiopsida, Equisetidae (horsetail)). k, Parablechnum schiedeanum (Polypodiopsida, Polypodiidae (leptosporangiate fern)). l, Ginkgo biloba (Ginkgophyta). m, Pseudotsuga menziesii (Pinophyta (conifer)). n, Welwitschia mirabilis (Gnetophyta). o, Bulnesia arborea (Angiospermae, eudicot, rosid). p, Paphiopedilum lowii (Angiospermae, monocot, orchid). a, Photograph reproduced with permission of Thieme Verlag, Stuttgart⁶⁶. b–e, Photographs courtesy of M. Melkonian. f–j, l–n, p, Photographs courtesy of D.W.S. k, Photograph courtesy of R. Moran. o, Photograph courtesy of W. Judd.