Basionym: Agaricus americanus Peck, Annual Report on the New York State Museum of Natural History 23: 71 (1872) [MB#466262] Obligate synonyms: - Leucocoprinus americanus (Peck) Redhead, Edible and poisonous mushrooms of Canada: 323 (1979) [MB#316813] - Lepiota americana (Peck) Sacc., Sylloge Fungorum 5: 43 (1887) [MB#248928] Taxonomic synonyms: - Agaricus cupreus Schulzer, Verhandlungen der Zoologisch-Botanischen Gesellschaft Wien 27: 112 (1877) [MB#199842] - Lepiota bresadolae Schulzer, Hedwigia 24 (4): 132 (1885) [MB#237418]