Invasion of the Coffin Snatchers

We are covering a local cemetery as part of a foray next week - I blipped a few fungi from here this time last year See here and here. I was a bit undecided what to do today, but when the sun came out, I decided to go down and have a look to see what was around.
There were quite a few waxcaps and some coral fungi, and also clumps of these Common Inkcaps (Coprinopsis atramentaria)
Several interesting things about them - as Roger Phillips says:
Edible but dangerous because it causes alarming symptoms (nausea, palpitations) when taken in conjunction with alcohol; indeed, it has been given to alcoholics to cause these symptoms and eventually cure their habit. Good black drawing ink used to be made from the deliquesced caps by boiling the black "ink" with a little water and cloves.
He also says:
Habitat usually in clusters on the ground near rotting or buried wood :-\