Pleopsidium chlorophanum (gold cobblestone lichen) is a distinctively colored, bright lemon-yellow to chartreuse crustose lichen, which favors dry arctic or alpine sandstone cliffs and boulders. It's a rare alpine lichen in Europe. It is in the Pleopsidium genus of the Acarosporaceae family. It is similar to Acarospora schleicheri, which grows on soil (terricolous lichen) and rarely on rock, and to Pleopsidium flavum. that grows in high elevations (montane to alpine) on vertical or overhanging hard felsic rock (e.g. granite) in western North America.