What on earth am I looking at?

11 months ago

Anyone have any idea what this is? It just (very easily) snapped off an internal wall in the cupboard where our boiler is. Hard to touch, dry, about the size of large palm of a hand. It has left two circles on the wall paintwork where it was attached, one seems to have “wooden” nodules in the centre. Is it some kind of fungus or a nest? Should we be worried?

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