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Huge carpophore, over 50 cm across. Hooflike close to the tree, becoming very large and flat toward edges.
This fungus is a tree pathogen and decomposer, and infects mainly broad-leaved trees through broken bark, or grows on already weakened tree. Found throughout Europe and Asia, and usually grows isolated. Here, seen growing on tree on a pathway between a pasture and a wheat field, rural part of Geneva suburbs.
Not edible, but some sources mention some medical use (can't say what kind...). The most popular use use was as tinder or amadou - it was most famously found on Otzy, the Iceman (5000 years old frozen natural mummy found in Italian Alps in 1991), explaining the name "Iceman fungus".