Data accessibility
The data that support the findings of this study are openly available from online repositories. All Illumina MiSeq raw reads are available on the NCBI Sequence Read Archive with the accession numbers SAMN14535185-SAMN14535228, under the Bioproject number PRJNA623014. All rbcL sequence alignments and tree files are found on Figshare (https://doi.org/10.6084/m9.figshare.12933017). Data are under embargo until publication and any further data required are available from the corresponding author upon reasonable request.