Amandinea decedens is a crustose lichen in the family Caliciaceae, first described as Lecidea decedens by Finnish botanist William Nylander in 1869.[1] [2] 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] [3]
On coastal rocks, when it is found, it is abundant.[4]