cellar "fungus"

cellar

Observation - cellar "fungus". Description: This was found growing on the wall of a cellar, and did not appear to be connected to any woodwork. It is flat to the wall and grows in concentric rings and then gradually turns darker. It never gets beyond 12cm in diameter. It's been here for a while now

This was found growing on the wall of a cellar, and did not appear to be connected to any woodwork. It is flat to the wall and grows in concentric rings and then gradually turns darker. It never gets beyond 12cm in diameter. It's been here for a while now but no one knows what it is!