A big grey one.
Other lichens: https://www.inaturalist.org/observations/111707769 https://www.inaturalist.org/observations/111707767 https://www.inaturalist.org/observations/111707766
On bark of Populus tree
On Xanthoria parietina on Hawthorn
On apothecia of Xanthoria parietina on Oak (Quercus sp). LNHS meeting
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