Xanthomendoza kashiwadanii is a species of saxicolous (rock-dwelling), crustose lichen in the family Teloschistaceae.

[1] 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 Morro Chico [es] (Magallanes Region, Chile), at an altitude of 230 m (750 ft), 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.