They were absolutely huge (my use of the past tense confirms that they have since been destroyed and have rotted) - I've seen nothing like them before. They must have stood 8 inches high and their caps were as much across. I have no idea whether they would be edible and I don't think I'd be interested in finding out!
I sketched them from one of my photos and watercoloured them and then spent hours trying to find an appropriate verse to add. Have you any idea how few quotations there are containing 'mushroom'?