Basionym: Agaricus lacmus Schumach., Enumeratio Plantarum, in Partibus Sællandiae Septentrionalis et Orientalis Crescentium 2: 333 (1803) [MB#372163] Obligate synonyms: - Cuphophyllus lacmus (Schumach.) Bon, Documents Mycologiques 14 (56): 11 (1985) [MB#104156] - Hygrophorus lacmus (Schumach.) Kalchbr., Icon. Sel. Hymenomyc. Hung.: 42 (1873) [MB#168076] - Camarophyllus lacmus (Schumach.) J.E. Lange, Dansk botanisk Arkiv 9 (6): 96 (1938) [MB#252916] - Hygrophorus subradiatus var. lacmus (Schumach.) Fr., Epicrisis Systematis Mycologici: 329 (1838) [MB#438492] - Agaricus pratensis var. lacmus (Schumach.) Fr., Observationes mycologicae 2: 117 (1818) [MB#497990] - Camarophyllus subradiatus * lacmus (Schumach.) P. Karst.: 229 (1879) [MB#569583] - Hygrophorus subradiatus * lacmus (Schumach.) Fr., Epicrisis Systematis Mycologici: 329 (1838) [MB#625806] - Hygrophorus subradiatus subsp. lacmus (Schumach.) Sacc., Sylloge Fungorum 5: 408 (1887) [MB#625805] Taxonomic synonyms: - Hygrophorus subviolaceus Peck, Annual Report on the New York State Museum of Natural History 53: 842 (1900) [MB#191830] - Cuphophyllus subviolaceus (Peck) Bon, Documents Mycologiques 14 (56): 11 (1985) [MB#105226] - Hygrocybe subviolacea (Peck) P.D. Orton & Watling, Notes from the Royal Botanical Garden Edinburgh 29 (1): 132 (1969) [MB#332205] - Camarophyllus subviolaceus (Peck) anon. ined. (1969) [MB#486569]