Russula betularum Hora, 1960 (syn: Russula betularum f. alba Socha & Hálek, 2011; Russula betularum var. betularum Hora, 1960; Russula betularum var. iodiolens Socha, 2011; Russula emetica sensu auct. mult. p.p. (2005) (misapplied name); Russula emetica var. betularum (Hora) Romagn., 1967; Russula fragilis sensu Pearson & Dennis (1948) (misapplied name));