Amandinea decedens is a crustose lichen in the family Caliciaceae, first described as Lecidea decedens by Finnish botanist William Nylander in 1869.

[1][3] It was assigned (invalidly) the name, Amandinea decedens, in 2002 by Juliane Blaha and Helmut Mayrhofer.

[1] The name was validly published in 2016 by Blaha, Mayrhofer and Jack Elix[1][2] On coastal rocks, when it is found, it is abundant.

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