Basionym: Agaricus elongatus Pers., Icones et Descriptiones Fungorum Minus Cognitorum 1: 3, tab. 1, fig. 4 (1798) [MB#455755] Obligate synonyms: - Psilocybe elongata (Pers.) J.E. Lange, Dansk botanisk Arkiv 9 (1): 30 (1936) [MB#217428] - Psilocybe uda var. elongata (Pers.) Gillet, Les Hyménomycètes ou Description de tous les Champignons qui Croissent en France 1: 586 (1878) [MB#438939] - Agaricus udus var. elongatus (Pers.) Fr., Systema Mycologicum 1: 292 (1821) [MB#498090] - Psilocybe uda subsp. elongata (Pers.) Sacc., Sylloge Fungorum 5: 1046 (1887) [MB#177008] - Geophila elongata (Pers.) Kühner & Romagn., Flore Analytique des Champignons Supérieurs: 334 (1953) [MB#297749] - Naematoloma elongatum (Pers.) Konrad, Bull. Mens. Soc. Linn. Lyon: 135 (1929) [MB#521829] Taxonomic synonyms: - Nematoloma elongatipes (Peck) Singer (1951) [MB#301685] - Naucoria obtusissima Kauffman, Papers of the Michigan Academy of Sciences 17: 188 (1933) [MB#272626] - Agaricus elongatipes Peck, Annual Report on the New York State Museum of Natural History 29: 40 (1878) [MB#485905] - Hypholoma elongatipes (Peck) A.H. Sm., Mycologia 33 (1): 5 (1941) [MB#287171] - Pholiota elongatipes (Peck) A.H. Sm. & Hesler, The North American species of Pholiota: 143 (1968) [MB#319961] - Psilocybe elongatipes (Peck) Peck, Bulletin of the New York State Museum 157: 104 (1912) [MB#217358] - Hygrophorus elongatipes (Peck) A.H. Sm. (1941) [MB#505091] - Naematoloma elongatipes (Peck) Singer, Lilloa 22: 504 (1951) [MB#521830] - Nematoloma elongatum (Pers.) Konrad (1929) [MB#122401]