Physconia perisidiosa:

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Physconia_perisidiosa-25x_K.jpg Physconia perisidiosa
Benrath, on acer
July 2012
Thallus grey-greeen to brown, irregular, up to 3cm. Lobes scaly and overlapping, with lip shaped soralia. Pruinose at the tips. Underside dark in the center, becoming bright to the margins. Rhizines frequent, dark, sometimes bottle-brush-like. Medulla white. Apothecia rare. On bark, especially acer, ulmus fraxinus. Chemistry: R-, Microscopy, Stereomicroscope, Microfoto