Fig. S1. Phylogenetic tree resulting from ML analysis of the ITS gene region alignment. The confidence values are indicated at the nodes in the same way as in Fig. 7. Genus clades are discriminated with boxes in different colours and clades containing thermophilic species are highlighted with an orange background. The scale bar shows the expected number of changes per site. The tree is rooted with Pseudoechria longicollis and Schizotheciaceae, in the Schizotheciaceae.<br />Fig. S2. Phylogenetic tree resulting from ML analysis of the partial tub2 gene region alignment. The confidence values are indicated at the nodes in the same way as in Fig. 7. Genus clades are discriminated with boxes in different colours and clades containing thermophilic species are highlighted with an orange background. The scale bar shows the expected number of changes per site. The tree is rooted with Pseudoechria longicollis and Schizotheciaceae, in the Schizotheciaceae, Sordariales.<br />Fig. S3. Phylogenetic tree resulting from ML analysis of the partial rpb2 gene region alignment. The confidence values are indicated at the nodes in the same way as in Fig. 7. Genus clades are discriminated with boxes in different colours and clades containing thermophilic species are highlighted with an orange background. The scale bar shows the expected number of changes per site. The tree is rooted with Pseudoechria longicollis and Pseudoechria prolifica, in the Schizotheciaceae.<br />Fig. S4. Phylogenetic location of “Humicola koreana” based on the separate analyses of partial gene sequences of ITS (A) and LSU (B). The confidence values are indicated at the nodes in the same way as in Fig. 7. The scale bar shows the expected number of changes per site. The tree is rooted with Achaetomium strumarium.<br />Table S1. Comparison ascospore sizes measured in lactic acid (present study) and water (literature) as mounting medium.<br />Table S2. Overview species and strains used in phylogenetic analysis.