These fungi do not form a monophyletic group and the type species is firmly within the concept of Cudonia, phylogenetically. A published sequence of the one species not included in this study (https://www.ncbi.nlm.nih.gov/nucleotide/KY867550.1) suggests the same pattern holds.
Ge, Z.-W., Z. L. Yang, D. H. Pfister, M. Carbone, T. Bau & M. E. Smith. (2014) Multigene Molecular Phylogeny and Biogeographic Diversification of the Earth Tongue Fungi in the Genera Cudonia and Spathularia (Rhytismatales, Ascomycota). PLoS ONE 9(8): e103457. doi: 10.1371/journal.pone.0103457 (Link)
Unintended disagreements occur when a parent (B) is
thinned by swapping a child (E) to another part of the
taxonomic tree, resulting in existing IDs of the parent being interpreted
as disagreements with existing IDs of the swapped child.
Identification
ID 2 of taxon E will be an unintended disagreement with ID 1 of taxon B after the taxon swap
If thinning a parent results in more than 10 unintended disagreements, you
should split the parent after swapping the child to replace existing IDs
of the parent (B) with IDs that don't disagree.
