Basionym: Agaricus cinerellus P. Karst., Meddelanden af Societas pro Fauna et Flora Fennica 2: 180 (1878) [MB#463342] Obligate synonym: Omphalia cinerella (P. Karst.) J.E. Lange, Flora Agaricina Danica 2: 61 (1936) [MB#260825] Taxonomic synonyms: - Mycena cineroides V. Hintikka, Karstenia 6-7: 80 (1963) [MB#334574] - Mycena brownii A.H. Sm., North American species of Mycena: 363 (1947) [MB#288480] - Omphalia serotina Peck, Bulletin of the Torrey Botanical Club 34: 98 (1907) [MB#186353] - Mycena serotina (Peck) A.H. Sm., North American species of Mycena: 375 (1947) [MB#288545] - Omphalopsis serotina (Peck) Murrill, North American Flora 9 (5): 314 (1916) [MB#503122] - Mycena albogrisea Peck, Bulletin of the New York State Museum 116: 27 (1907) [MB#225865] - Prunulus albogriseus (Peck) Murrill, North American Flora 9 (5): 327 (1916) [MB#503467]