Maximum likelihood analyses of phylogenetic relationships of sampled Microbotryum specimens. The tree shown was inferred from the PCMA alignment with PhyML under a TrN+I+G model of site substitution. Branch lengths are scaled in terms of expected numbers of nucleotide substitutions per site. For explanation of the three Microbotryum groups on the right-hand side see discussion. Abbreviations are as in Fig. 1. The dashed line indicates that Microbotryum group 2 is not a monophyletic group.