Coprinus on herbivore dung

If you incubate herbivore dung in a plastic container you get a succession of  fungi fruiting on the droppings.     Late in the cycle, a number of tiny mushrooms form. Very often these are species of Coprinus (inky caps).  These are hard to identify   to species without the proper keys and/or textbooks but they do have an interesting look.  In this case, as the lid was removed from the box, the change in air presure caused the delicate stalks to collapse.