Basionym: Agaricus caerulescens Schaeff., Fungorum qui in Bavaria et Palatinatu circa Ratisbonam nascuntur Icones 4: 17, t. 34 (1774) [MB#477036] Obligate synonyms: - Cortinarius coerulescens (Schaeff.) Fr. (1838) [MB#528824] - Bulbopodium caerulescens (Schaeff.) Earle, Bulletin of the New York Botanical Garden 5: 441 (1909) [MB#100632] - Cortinarius caerulescens (Schaeff.) Fr., Epicrisis Systematis Mycologici: 265 (1838) [MB#205504] - Agaricus violaceus Batsch, Elenchus fungorum: 47 (1783) [MB#490483] - Agaricus bulbosus Huds., Flora anglica: 611 (1778) [MB#490118] - Agaricus cyanus Pers., Synopsis methodica fungorum: 276 (1801) [MB#497055] - Agaricus cyanus var. caerulescens (Schaeff.) Pers., Synopsis methodica fungorum: 277 (1801) [MB#497764] - Cortinarius cyanus var. caerulescens (Schaeff.) Gray, A natural arrangement of British plants 1: 627 (1821) [MB#500383] - Phlegmacium coerulescens var. coerulescens (?) [MB#429745] - Agaricus cyanus ß caerulescens (Schaeff.) Gray (1821) [MB#534210] - Agaricus cyanus ß caerulescens (Schaeff.) Pers., Synopsis methodica fungorum: 277 (1801) [MB#476959] - Phlegmacium caerulescens var. caerulescens (Schaeff.) Wünsche (1877) [MB#569034] - Gomphos caerulescens (Schaeff.) Kuntze, Revisio generum plantarum 2: 853 (1891) [MB#648224] Taxonomic synonyms: Phlegmacium coerulescens (Schaeff.) Wünsche (1877) [MB#357327]