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Lichen foliose, the thallus is green when wet, drying grey or grey-brown. The margins are sorediate, lobe surfaces pruinose, at least at the tips. It has black bottle-brush-like rhizines on the undersides and the medulla is yellowish. The apothecia are rare.
Widespread, usually on nutrient-rich bark, rarely on walls. This one was spotted on a Holm oak bark