MCC phylogenetic tree showing the relationships between the mycobiont samples studied. Branches in bold are those with a posterior probability (PP) ≥ 0.95. Groups inferred by a genetic distance of 0.02% of dissimilarity and supported by morphological data are separated by dashed lines and denote by roman numerals (correspondences can be found in Table 1). Each sample has associated with the photobiont haplotype found associated (depicted with a color code, corresponding to colors and haplotypes showed in Fig. 3). Conflicts among DNA-based species delimitation methods are depicted by means of letters: a, Carbonea sp. (s217) is included in Carbonea vorticosa (I) using the 0.05 cutoff; b, Austrolecia sp. 2 (s177 and s178) was included in Austrolecia sp. 1 using the 0.05 cutoff; c, Austrolecia sp. 3 (s116) was included in Austrolecia sp. 1 using the 0.05 cutoff; d, Austrolecia sp. 3 (s116) was included in Austrolecia sp. 1 using the 0.05 cutoff and the single GMYC; e, multiple GMYC recognized s169 as a different taxon; f, multiple GMYC split Umbilicaria aprina (XV) as two different taxa; g, neither of the GMYC algorithms nor the 0.05 cutoff were able to recognize Polysporina sp. as a different entity different from Polysporina frigida; h, single GMYC failed to recognize Acarospora cf. nitrophila as an independent entity; i, multiple GMYC split Rhizoplaca macleanii in two taxa.