pixie cup
noun
1 US a white-flowered bulbous plant, Nothoscordum bivalve (family Amaryllidaceae), of the south-eastern United States ( rare ).
2Any of several lichens of the genus Cladonia, having cup or goblet-shaped fruiting bodies, especially the widespread C. pyxidata; also in plural.
Origin
Early 20th century; earliest use found in Transactions of the Kansas Academy of Science.