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Growth type foliose.
Photos: On planted Malus. Macroom, Cork, SW Ireland.
Small, adpressed, greenish-brown thallus that can coalesce to cover large areas. Lower surface white, few white rhizinae. Upper surface with yellowish-green soredia. Apothecia infrequent, discs brown with smooth, swollen margins.
Microscope photo
below.
Becoming more frequent on dusty, nutrient-enriched shaded trees and rocks. In urban areas it is often found in the canine-zone at base of trees. Chemical reactions negative
