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Teloschistaceae
Xanthoria parietina Growth type foliose. Chemical results: K+ crimson / purple Common on nutrient-rich rocks, trees, walls and roofs in coastal, rural and urban habitats. Very resistant to air pollution and increasing rapidly due to nitrates and ammonia from car exhausts and agricultural chemicals. Thallus with large, overlapping, yellow-orange lobes, greyish-yellow in shade. Apothecia are abundant, orange discs with smooth margins. Spores polaricular, 12-16 x 7-9 µm. Micro photographs below. Immature thalli can be confused with Xanthoria polycarpa Host to various lichenicolous fungi including Arthonia parietinaria, Didymocyrtis slaptoniensis, Illosporiopsis christiansenii, Opegrapha physciaria, Telogalla olivieri and Xanthoriicola physciae |
