Michael, your fungus would appear to be a member of the Peziza, otherwise known as the cup fungi. Beyond that I cannot go as there are a number of species that grow on rotting wood or plasterboard; I even found a nice collection once on a rotting doormat!
Peter, I see what you mean! I think we all need cheering up this weather. So her's something else - a photo of Fryerning Churchyard taken a few days ago. It has been so wet spring that they have not been able to
cut the grass but I'm sure the deceased - my parents and grandparents among them - will be happy enough to reside among this sea of Dog Daises and other wild flowers. It is with the living where the problem lies, as many see such a scene as synonymous with neglect and disrespect for the dead.