Figure S1. Type specimens of: (A) Dictyota divaricata J. V. Lamoroux (CN X7F67); (B) Dictyota pusilla J. V. Lamoroux (CN C7F75); drawing of Dictyota pusilla J. V. Lamoroux (CN C7F75); (D) Zonaria dichotoma var. intricata C. Agardh (LD 48910); and (E) Zonaria linearis C. Agardh (LD 487921 Scale bars, 1 cm).

Table S1. Specimens used in the psbA analysis with indication of collecting data and accession numbers. Non-European taxa are indicated below the grey bar. Asterisks indicate the subset of 57 sequences used for the haplotype network.

Table S2. Specimens used in the multigene alignment constructed using six (rbcL, psbA, nad1, cox1, cox3, and LSU rDNA) and a single representative of each species, with indication of collecting data.

Table S3. GenBank accession numbers of the sequences used in the concatenated alignment, including strain numbers and sequence length.

Table S4. Partitioning strategies, corresponding nucleotide substitution models, and their respective likelihood and Bayesian information criterion (BIC) values. Partitioning the data set by rDNA (LSU), chloroplast, mitochondrial DNA, and by codon positions yielded the lowest BIC value (bold) and was hence selected for further analyses.

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