They concluded their paper stating: "Minor differences in the amyloid reaction of the ascus apex as viewed with the light microscope are, in our opinion, not a sound basis for the delimitation of families in lichenized ascomycetes as has been suggested by Hafellner (1984)".

[4] Christoph Scheidegger and Matthias Schultz proposed to reinstate the Harpidiaceae in a 2004 publication, based on preliminary DNA sequence data that suggested its phylogenetic distinctiveness.

[6][7][8] In a corrected and amended version of the "2016 classification of lichenized fungi in the Ascomycota and Basidiomycota", the Harpidiaceae was added as Pezizomycotina incertae sedis.

To support this decision, the authors mentioned two nuSSU sequences for Harpidium and Euopsis, available on Genbank, but, at the time of publication, without a published phylogeny.

In their own (unpublished) analysis, the genera were shown to be closely related and "form a clade apparently not nested within Lichinomycetes or any other known class in the Ascomycota".