A new genus, Tricholomella Zer. ex Kalam. (Tricholomatales, fam. Tricholomataceae), is described with one species Tricholomella constrictum (Fr.) Zer. ex Kalam., comb. nov. (= T. leucocephalum (Fr.) Zer., nom. inval.) and the distribution data of this species in East Europe and Asia are presented.