Figure 3.

Frequency of nucleotide substitutions along adjacent nucleotide sites for the large subunit and 5.8S nrRNA genes. The comparison is between the lichenized Omphalina clade (five species) and its sister nonlichenized clade (nine species; Fig. 2A). (A) Number of nucleotide substitutions in the lichenized clade/number of nucleotide substitutions in the nonlichenized sister clade for each adjacent nucleotide pairs. (B) Distribution of nucleotide substitutions (%) for all types of adjacent nucleotide sites as recorded for the lichenized and nonlichenized sister clades.