ACKNOWLEDGEMENTS
The authors would like to thank Theodor E. Bolsterli, Monika Dragsted, Jan Hostrup, Morten L. Stephensen and other members of the plant facilities team at PLEN (University of Copenhagen) for assistance while growing the plants in the greenhouse and climate chamber. We would also like to thank Catherine S. Nielsen and Sebastian Kjeldgaard-Nintemann from the Center for Advanced Bioimaging (CAB, University of Copenhagen), and Klaus Qvortrup from the Core Facility for Integrated Microscopy (CFIM, University of Copenhagen), for invaluable help during sample preparation and imaging. Finally, we would like to thank Petr Pavelka for sharing the images of C. ausensis subsp. titanopsisgrowing in the wild shown in Fig. 2 .