L. appalachensis was moved back to H. appalachensis, and most of the others haven't been added to iNaturalist yet. The one remaining is Leucodermia guzmaniana, and unfortunately nothing can be done for that one, since it was erected in the new genus and has no other synonyms. Perhaps it could be moved to be a child of Heterodermia, and Leucodermia made a synonym of Heterodermia, but I don't particularly want to be the person to make that decision myself.

I think that is likely too. But not much evidence has been provided for its establishment yet, and as things stand I think it is sitting in the middle of Heterodermia with "unnamed" clades surrounding it, based on the Korean phylogeny.