Xanthomendoza is a genus of small, bright orange foliose lichens with lecanorine apothecia.

[1] Members of the genus are commonly called sunburst lichens or orange lichens because of their bright orange color.

[2]: 130 Members of Xanthomendoza were formerly classified in the genus Xanthoria, but Xanthomendoza members have rhizenes or scattered holdfasts, while Xanthoria do not, and they have different conidia.

[2] Lichen spot tests on the upper cortex are K+ purple, KC−, C−, and P−.

[2] As of January 2024[update], Species Fungorum (in the Catalogue of Life) accepts nine species of Xanthomendoza:[3]