Lecanoromycetes is the largest class of lichenized fungi. It belongs to the subphylum Pezizomycotina in the phylum Ascomycota. The asci (spore-bearing cells) of the Lecanoromycetes most often release spores by rostrate dehiscence.
The group is monophyletic (composed only of all the descendants of a common ancestor).
There are several genera in the Lecanoromycetes that have not been placed into any order or family. These are: