K. albocrenulata K. gilfillaniorum K. kaernefeltii Kaernefia is a genus of crustose lichens in the family Teloschistaceae.

[1] Kaernefia was circumscribed in 2013 by Sergey Kondratyuk, John Elix, Arne Thell, and Jae-Seoun Hur, based on a molecular phylogenetic analysis of the family Teloschistaceae.

The generic name honours their colleague, Swedish lichenologist Ingvar Kärnefelt, for "his many contributions to lichenology, in particular lichens of the Teloschistaceae and Parmeliaceae".

[2] Species in Kaernefia have a poorly developed, indistinct thallus comprising tiny granules or granule-like isidia.

Lichen products reported from the genus include parietin and O-methylvioxanthin as major compounds, and trace amounts of fallacinal, teloschistin and atranorin.