The Xanthoria parietina is an indicator of nutrient richness. The species is very common in areas of intensive livestock farming and busy roads. The presence of ammonia helps their growth. It grows on the bark of trees, on stony surfaces such as concrete, brick, cement and paving stones and on the asphalt of roads. Since the 80's, the species has become increasingly common in the Netherlands, because it can benefit from pollution with nitrogen compounds. The presence of Xanthoria parietina around one of the flower fields and meadows tells a lot about the development that can be expected in the field.