Pixie cup may refer to: Fungi * Geopyxis carbonaria, fungus also known as a "pixie cup" * Geopyxis vulcanalis, fungus commonly known as the "vulcan pixie cup" * Scutellinia scutellata, fungus also known as the "eyelash pixie cup"Lichen * A number of species of the lichens Cladonia (cup lichen) * Cladonia asahinae, lichen commonly known as "pixie cup lichen"