Map Lichen (Rhizocarpon geographicum) in ultra violet light
The map lichen (Rhizocarpon geographicum) is a species of lichen distributed on rocks, in areas with low air pollution. This is a specimen from the Carpathian Mountains grown on silicate rock (granite). Under long wave ultra violet light (365 nm) the yellow turns to red color, an effect that can be observed by several yellow lichen species. With a shorter wave length of the ultra violet light (254 nm) the color changes to green.