Blastenia is a genus of lichen-forming fungi in the family Teloschistaceae.

[1] The genus was circumscribed in 1852 by Abramo Bartolommeo Massalongo.

[2][3] The genus has a cosmopolitan distribution.

[1] As of January 2024[update], Species Fungorum (in the Catalogue of Life) accepts 29 species of Blastenia.

[4]