"Coprinus sterquilinus" is closely related to the shaggy ink cap ("Coprinus comatus"). On at least one occasion they have been mistaken for "Coprinus comatus". This poisonous species can sometimes be confused with the edible "Coprinus comatus". "Coprinus comatus" is the type species for the genus "Coprinus". "Coprinus comatus" is the best known of the true "Coprinus".