Coprinopsis picacea is a species of fungus in the Psathyrellaceae. It was first described in 1785 by French mycologist Jean Baptiste François Pierre Bulliard in 1785 as Agaricus picaceus.
When fresh, their glistening caps are cylindrical and covered in tattered veil remnants.
As the gills liquify, the cap shrinks and flattens. Its brim rolls up and drips an inky substance. This allows all the spores to get their turn at maximum exposure, so they can be carried away by air currents.