See text Acanthothecis is a genus of lichen-forming fungi in the family Graphidaceae.

[1] The genus was circumscribed by Frederick Edward Clements in 1909.

[2] As of April 2023[update], Species Fungorum (in the Catalogue of Life) accepts 56 species of Acanthothecis.

[1] Former species; A. salazinica S. Joshi & Hur (2013) = Acanthothecis yokdonensis