Xanthoria is a genus of lichenized fungi in the family Teloschistaceae. Common names include orange lichen,Xanthoria. USDA PLANTS. orange wall lichen,Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, and sunburst lichen. They can be identified by their characteristic squamulose morphology with distinctive "fairy cups".
Species , Species Fungorum (in the Catalogue of Life) accepts 19 species of Xanthoria. Xanthoria aureola Xanthoria calcicola Xanthoria coomae Xanthoria ectaneoides Xanthoria hypogymnioides Xanthoria ibizaensis Xanthoria juniperina Xanthoria kangarooensis Xanthoria lapalmaensis Xanthoria parietina – common orange lichen, yellow scale, maritime sunburst lichen, shore lichen Xanthoria polessica Xanthoria pylyporlykii – Europe Xanthoria rutilans Xanthoria schummii Xanthoria splendidula Xanthoria ulophyllodes – powdery sunburst lichenWaleski Joe (2007). Lichens of the North Woods Duluth, MN: Kollath+Stensaas Xanthoria whinrayi Xanthoria yorkensis
The taxa Xanthoria coomae and Xanthoria polessica were determined to be the same species as X. parietina in a 2020 publication. The taxon once known as Xanthoria elegans is now Rusavskia elegans, the type species of genus Rusavskia.
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