Tree showing diversity between the strains with identical SSU rRNA gene sequences. Branch colors represent the lichen sources as follows: blue R. fuciformis, green L. confinis, red L. pygmaea. Phylogenetic tree inferred on concatenated sequences of the 5 protein coding sequences (atpD, gyrB, recA, rpoB and trpD) using neighbor-joining analyses. Confidence in tree topology was calculated by bootstrap test amongst 1000 replicates. There were a total of 3844 positions in the final dataset.