Notes:
Oxner wrote that X. coppinsii is rather similar to X. webery, but lobes are shorter.

It grows in rather dry mixed forest at the bark of elm (Ulmus densa) and minor on maple (Acer negúndo).
Acer negundo originated from North America (moved in the past).

Images

Xanthoria (Fr.).jpg
Xanthomendoza coppinsii_with Caloplaca_GPS29.jpg
49.89767°"N”, 73.03724°"E”, 521m
Xanthomendoza fulva_GPS29_.jpg
49.89767°"N”, 73.03724°"E”, 521m

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Comments

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I agree
By: Jason Hollinger (jason)
2016-04-26 15:19:09 CDT (-0400)

Looks like Xanthomendoza in particular (separated from Xanthoria several years ago). In North America, I would guess Xanthomendoza fulva.