This sixth contribution provides a detailed clarification of the critical taxa related to Inocybe albidodisca Kühner, based on the authors’ collections and study of original diagnoses. The following species are examined and discussed: 1. Inocybe subalbidodisca Stangl et Veselský spec. nov., 2. Inocybe albidodisca Kühner, 3. Inocybe fulvida Bresadola sensu Huijsman, 4. Inocybe subbrunnea Kühner, 5. Inocybe ovalispora Kauffman sensu Kühner et Romagnesi.
Stangl J., Veselský J. (1975): Beiträge zur Kenntnis seltenerer Inocyben. Nr. 6: Inocybe albidodisca Kühner und etliche ähnliche der gänzlich stielbereiften Glattsporigen. (Farbtafel Nr. 87). – Česká Mykologie 29(2): 65–78.