Adamczyk (1996)[2591] (as Collybia butyracea), Adamczyk (2003)[1263] (as: Collybia butyracea), Adamczyk (2003)[1264] (as: Collybia butyracea), Adamczyk (2007)[1268], Adamczyk et al. (2008)[1281], Anonim (1968)[2597] (as Collybia butyracea), Barkman & de Vries (1993)[2605] (as Collybia butyracea), Bartnik et al. (2015)[1300] (as: Collybia butyracea), Behnke-Borowczyk et al. (2021)[4037], Brzeg et al. (2000)[2623] (as Collybia butyracea), Bujakiewicz (1973)[2632] (as Collybia butyracea), Bujakiewicz (1974)[3350] (as Collybia butyracea), Bujakiewicz (1978)[3824] (as Collybia butyracea), Bujakiewicz (1978)[3351] (as Collybia butyracea), Bujakiewicz (1979)[2635] (as Collybia butyracea), Bujakiewicz (1981)[3657] (as Collybia butyracea), Bujakiewicz (1982)[3404] (as Collybia butyracea), Bujakiewicz (1982)[3658] (as Collybia butyracea), Bujakiewicz (1986)[2636] (as Collybia butyracea), Bujakiewicz (1987)[3836] (as Collybia butyracea), Bujakiewicz (1997)[2644] (as Collybia butyracea), Bujakiewicz (2004)[1339] (as: Collybia butyracea), Bujakiewicz & Kujawa (2000)[1345], Bujakiewicz & Lisiewska (1983)[2652] (as Collybia butyracea), Bujakiewicz & Springer (2009)[1350], Celka (2002)[1357] (as: Collybia butyracea), Chachuła (2009)[1360], Chachuła (2018)[1365], Chachuła (2022)[4102], Chachuła (2023)[3714], Chachuła et al. (2015)[1372], Chachuła et al. (2016)[4094], Chachuła et al. (2021)[1375], Domański (1955)[2677] (as Collybia butyracea), Domański et al. (1960)[2710] (as Collybia butyracea), Domański et al. (1963)[2711] (as Collybia butyracea), Domański et al. (1967)[2712] (as Collybia butyracea), Domański Z. (2001)[3794] (as Collybia butyracea), Domian et al. (2025)[4107], Fiedorowicz (2009)[1441], Fiedorowicz (2020)[1444], Fijałkowski et al. (1992)[2772] (as Collybia butyracea), Fijałkowski et al. (1992)[2773] (as Collybia butyracea), Flisińska (2000)[3510] (as Collybia butyracea), Flisińska (2000)[1448] (as: Collybia butyracea), Flisińska (2000)[1449] (as: Collybia butyraceae), Flisińska (2000)[1450] (as: Collybia butyracea), Flisińska (2004)[1452] (as: Collybia butyracea), Gierczyk et al. (2013)[1502], Grzesiak et al. (2017)[1533], Gumińska (1959)[2813] (as Collybia butyracea), Gumińska (1962)[2816] (as Collybia butyracea), Gumińska (1966)[2818] (as Collybia butyracea), Gumińska (1968)[3521] (as Collybia butyracea), Gumińska (1969)[2820] (as Collybia butyracea), Gumińska (1976)[2825] (as Collybia butyracea), Gumińska (1992)[2833] (as Collybia butyracea), Gumińska (1992)[2832] (as Collybia butyracea), Gumińska (2006)[1537] (as: Collybia butyracea), Hennings (1892)[2845] (as Collybia butyracea), Jasnowska et al. (1986)[2878] (as Collybia butyracea), Jóźwiak & Wrzosek (2007/2008)[1615] (as: Collybia butyracea), Kandefer-Szerszeń et al. (1980)[2882] (as Collybia butyracea), Karasiński (2009)[1637], Komorowska (2000)[1668], Kozłowska et al. (2015)[1704], Kozłowska et al. (2019)[1706], Kujawa et al. (2023)[3757], Lisiewska (2004)[1839] (as: Collybia butyracea), Lisiewska & Flisiewicz (2006)[1842], Lisiewska & Malinger (2001)[1846], Lisiewska & Płaczek (1993)[2983] (as Collybia butyracea var. butyracea), Ławrynowicz (1973)[2994] (as Collybia butyracea), Ławrynowicz (2001)[1859] (as: Collybia butyracea), Ławrynowicz & Szkodzik (2002)[1872], Ławrynowicz et al. (2001)[1867] (as: Collybia butyracea), Ławrynowicz et al. (2002)[1863], Łuszczyński (1998)[3005] (as Collybia butyracea), Łuszczyński (2001)[1886] (as: Collybia butyracea), Nita & Bujakiewicz (2005)[2010] (as: Collybia butyracea), Olesiński & Wojewoda (1985)[3069] (as Collybia butyracea), Pietras et al. (2016)[2079], Rudawska et al. (2022)[4082], Stasińska (2008)[2229], Stasińska (2012)[2235], Stasińska et al. (2024)[3924], Stokłosa i in. (2019)[2272] (as: Collybia butyracea), Sumorok et al. (2008)[2283], Sumorok et al. (2013)[2284], Szczepkowski et al. (2008)[2347], Szkodzik (2005)[2371] (as: Collybia butyracea), Ślusarczyk (2016)[2391], Ślusarczyk (2026)[4405] (as Rhodocollybia butyracea), Wilga (2004)[2445] (as: Collybia butyracea), Wilga & Wantoch-Rekowski (2025)[4070], Wilgan et al. (2026)[4508] (as Rhodocollybia butyracea), Wojewoda (1965)[3361] (as Collybia butyracea), Wojewoda (2002)[2506]