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Table S1 Locality information for populations of A. fontanum subsp. fontanum and A. petrarchae subsp. bivalens sampled for this study. NR = information not recorded

Table S2 Chloroplast rps4 – trnS IGS haplotype data for A. fontanum subsp. fontanum. Gene diversity statistics for each region are shown

Table S3 Chloroplast trnL-F IGS haplotype data for A. petrarchae subsp. bivalens

Table S4 Definition of rps4 – trnS IGS haplotypes in A. fontanum subsp. fontanum and associated GenBank accession numbers

Table S5 Definition of trnL-F haplotypes in A. petrarchae subsp. bivalens and associated GenBank accession numbers

Table S6 Allozyme alleles observed in A. fontanum subsp. fontanum and A. petrarchae subsp. bivalens. Enzyme abbreviations follow Wendel & Weeden (1989)

Table S7 Allozyme diversity statistics and Structure genepool assignation proportions under K = 3 model for populations of A. fontanum subsp. fontanum. Abbreviations: n, number of individuals; P, proportion of polymorphic loci; A = number of alleles per locus; Ap = number of polymorphic alleles per locus; Ae = effective number of alleles per locus; HE = expected heterozygosity; HO = observed heterozygosity; f = inbreeding coefficient. 95% criterion used for determining polymorphic loci. All values correct to 3 d.p.

Table S8. Allozyme diversity statistics and Structure genepool assignation proportions under K = 3 model for populations of A. petrarchae subsp. bivalens. Assignations to clusters 2 and 3 were summed to give the yellow cluster proportion shown in Fig. 2B. Abbreviations: n, number of individuals; P, proportion of polymorphic loci; A, number of alleles per locus; Ap = number of polymorphic alleles per locus; Ae = effective number of alleles per locus; HE, expected heterozygosity; HO, observed heterozygosity; f, inbreeding coefficient. 95% criterion used for determining polymorphic loci. All values correct to 3 d.p.

Table S9. Comparison of genetic diversity measures in A. fontanum subsp. fontanum and A. petrarchae subsp. bivalens with those of other diploid European Asplenium taxa. n/a = data not available. Unpublished data for A. ceterach subsp. bivalens, A. trichomanes subsp. inexpectans, A. viride and A. hemionitis from JC Vogel and C Durães. Species information: A. hemionitis is a Macaronesian/SW European Atlantic fringe taxon of putative Tertiary origin. A. ceterach subsp. bivalens has a scattered eastern Mediterranean/Balkan distribution. A. trichomanes subsp. inexpectans has a main range in south central Europe, with scattered southern Mediterranean populations. A. viride is a widespread Alpine taxon also found in North America and Asia. Diversity measures are based on a very similar set of allozyme loci in all taxa.

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