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. 2021 Jun 17;4:754. doi: 10.1038/s42003-021-02277-w

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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 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 — Three later diverged CGA classes are situated as the closest living relatives to land plants; the Charophyceae, Coleochaetophyceae and the Zygnematophyceae, while the Klebsomidophyceae, Chlorokybophyceae and Mesostigmatophyceae are classes of earlier evolved CGA. The Chlorophytes and Prasinophytes are ancestral to CGA. Green algal species of interest here are illustrated by pictures. The Rhodophytes are used as ancestral group for the green plants.