Basionym: Agaricus calyptriformis Berk., Annals of Natural History 1: 198 (1838) [MB#449965] Obligate synonyms: - Godfrinia calyptriformis (Berk. & Broome) Herink, Sborník Severoceského Musea 1: 65 (1958) [MB#103396] - Hygrophorus calyptriformis (Berk. & Broome) Berk. & Broome, Outlines of British Fungology: 202 (1860) [MB#205482] - Hygrocybe calyptriformis (Berk. & Broome) Fayod, Annales des Sciences Naturelles Botanique ser. 7, 9: 309 (1889) [MB#355908] - Porpoloma calyptriformis (Berk. & Broome) Bresinsky, Regensburger Mykologische Schriften 11: 233 (2003) [MB#487164] - Humidicutis calyptriformis (Berk. & Broome) Vizzini & Ercole, Micologia e Vegetazione Mediterranea 26 (1): 99 (2012) [MB#563396] - Hygrocybe calyptraeformis (Berk.) Fayod (1889) [MB#587982] Taxonomic synonyms: - Hygrocybe calyptriformis f. calyptriformis , Annales des Sciences Naturelles Botanique ser. 7, 9: 309 (1889) [MB#419665] - Hygrocybe calyptriformis var. calyptriformis , Annales des Sciences Naturelles Botanique ser. 7, 9: 309 (1889) [MB#463649] - Godfrinia calyptraeformis (Berk. & Broome) Herink (1958) [MB#264221] - Agaricus calyptraeformis Berk. (1838) [MB#491381]