Coprinus or Inocybe?

Coprinus or Inocybe?

Observation - Coprinus or Inocybe? - UK and Ireland. Description: Fungi was picked by a friend, not known if had a bulbous base. Appears aged, seems like Inkcap as black residue when touched & melting down to an inky state. Has black spores. My immediate though however was incocybe from shape. Cap 11cm dia, exclusive st

Fungi was picked by a friend, not known if had a bulbous base. Appears aged, seems like Inkcap as black residue when touched & melting down to an inky state. Has black spores. My immediate though however was incocybe from shape. Cap 11cm dia, exclusive stem 18 cm. Thought by picker to be found growing on deadwood.