I have seen this in the case of coprinus micaceus several times.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
The species of coprinus are readily recognised from the black spores in addition to the fact that the gills, at maturity, dissolve into a black or inky fluid.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
They resemble small specimens of a coprinus.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson