Crypthonia is a genus of lichen-forming fungi in the family Arthoniaceae.

[1] The genus was circumscribed in 2010 by Andreas Frisch and Göran Thor, with Crypthonia polillensis assigned as the type species.

[2] As of July 2024[update], Species Fungorum (in the Catalogue of Life) accepts 16 species of Crypthonia,[3] but this does not yet account for three new species described from Brazil in 2024.

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