Physcia ascendens

Foliose, lobes with long marginal cilia and usually with helmet-like soralia at the tips; apothecia shortly-stalked with blue-black or thinly pruinose discs. Widespread and common on twigs, bark, walls and concrete, often in company with P. tenella and Xanthoria species as indicators of nitrogen enrichment. Generally more robust than P. tenella, with which it is usually mixed.