Ink cap mushrooms, or Coprinoid mushrooms, are a group of fungi that are characterized by their black spores and their tendency to deliquesce as they mature. There are over 100 species of ink cap mushrooms. Often associated with rotting wood, seen or unseen.
Ink Cap Mushrooms at Indiana Fungi
Resources:
Coprinoid Mushrooms at MushroomExpert.Com, with ID Key