Cornicularia is a genus of lichenised ascomycetes in the large family Parmeliaceae.

[1] It is a monotypic genus, with a single currently accepted species, the saxicolous lichen Cornicularia normoerica.

[2] This species has an erect caespitose growth form, and is sometimes referred to as the brittle lichen.

Cornicularia was originally proposed as a section of the genus Lichen by Johann Christian Daniel von Schreber in 1791.

[3] Erik Acharius promoted it to generic status in 1803.