Synonymy:
Agaricus elongatus Pers., Icon. Desc. Fung. Min. Cognit. (Leipzig) 1: 3 (1798)
Agaricus udus var. elongatus (Pers.) Fr., Systema Mycologicum 1: 292 (1821)
Psilocybe uda var. elongata (Pers.) Gillet, Les Hyménomycètes ou Description de tous les Champignons (Fungi) qui Croissent en France avec l'indication de leurs propriétés utiles ou vénéneuses (Alençon): 586 (1878)
Naematoloma udum subsp. elongatum (Pers.) P. Karst., Bidr. Känn. Finl. Nat. Folk 32: 497 (1879)
Psilocybe uda subsp. elongata (Pers.) Sacc., Syll. Fung. (Abellini) 5: 1046 (1887)
Agaricus udus subsp. elongatus (Pers.) Romell, in Krok & Almquist, Svensk Flora för skolor, II. Kryptogamer (edn 2) (Stockholm): 185 (1898)
Naematoloma elongatum (Pers.) Konrad, Bull. Soc. linn. Lyon 8: 135 (1929)
Psilocybe elongata (Pers.) J.E. Lange, Dansk bot. Ark. 9(no. 1): 30 (1936)

Position in classification:
Hypholoma, Strophariaceae, Agaricales, Agaricomycetidae, Agaricomycetes, Basidiomycota, Fungi

Note:
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