Xanthomendoza kashiwadanii is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae. Found in South America, it was formally described as a new species in 2009 by lichenologists Sergey Kondratyuk and Ingvar Kärnefelt. The type specimen was collected from (Magallanes Region, Chile), at an altitude of 230m (760feet), where it was found on a dry rocky cliff growing on rocks. The species epithet honours Japanese lichenologist Hiroyuki Kashiwadani, who collected the type. Xanthomendoza kashiwadanii is only known to occur in a few localities in Argentina and Chile, where it grows on volcanic and basalt rock.