Genetic subdivision of genotypes found in three Porphyra species inferred by Structure. Bar colours represent the proportions of individual genotypes attributable to K genetic clusters (K). Ploidy groups per species: Zp = zygotospores, Tetra = tetraploid (genotypes and gametes), Mx = Mixoploid, Mp = multiploid gametes, Triploid (genotypes and gametes). Ploidy types are denoted on the top of the plot, and ploidy levels on the bottom of the plot. Each genotype corresponds to either blades, gametes and/or zygotospores. (a) Structure analysis per species separately. (b) Structure analysis with all the data combined. Best Ks for each group are highlighted with the symbol (**).