Linus Zeitlmayr reports that young mushrooms are edible, but warns than older ones have a foul bitter or inky flavour and are possibly poisonous. The bitter flavour is allegedly improved by boiling the mushrooms and discarding the water, but is indigestible to many.
Linus Zeitlmayr suggests that young mushrooms can be consumed safely, whereas older ones have an unpleasant, bitter, or ink-like flavor and may be toxic. Boiling the mushrooms and removing the water might improve their taste, though they remain undigestible for some individuals.