Lichen on a rock

algae, boulder, bright, clean air, close up, color, colorful, common orange lichen, detail, ecosystem, environment, epiphyte, epiphytic, foliose, forest, fresh, fungi, fungus, gray, grey hypogymnia, indicator, lich, lichen, lichenized fungi, lichens, macro, map lichen, nature, old, orange, outdoor, parietin, parietina, park, pattern, physcia, physcia aipolia, physodes, plant, rhizocarpon, rhizocarpon geographicum, rock, scale, shore lichen, stone, sunburst, sunburst lichen, surface, symbiosis, thallus, wallpaper, wild, xanthoria, xanthoria parietina, yellow, yellow scale,