Volume 14A: Supplement, by E. Grilli, H. J. Beker, U. Eberhardt and N. Schütz. 2020. 294 col. photogr. 86 micrographs. 470 p. Hardcover. - In English, with keys in Italian, English, French and German.

Foreword, Acknowledgments, I Introduction, II Observational protocol, descriptive terminology and coding conventions, III Determining the correct sections, Key to Hebeloma sections, Key to Hebeloma section Denudata, IV An overview of the species confirmed in Italy, Taxonomy, V Hebeloma section Hebeloma, VI Hebeloma section Denudata, Hebeloma subsection Crustuliniformia, Hebeloma subsection Clepsydroida, Hebeloma subsection Echinospora, Hebeloma subsection Hiemalia, VII Hebeloma section Sinapizantia, VIII Hebeloma section Velutipes, IX Hebeloma section Duracinus, X Hebeloma section Myxocybe, XI Hebeloma section Naviculospora, XII Hebeloma section Scabrispora, XIII Hebeloma section Syrjense, XIV Hebeloma section Theobromina, XV Hebeloma section Sacchariolentia, XVI Hebeloma section Porphyrospora, XVII Hebeloma section Pseudoamarescens, XVIII European Hebeloma species not yet confirmed from Italy, Alpine or arctic species not yet confirmed from Italy, Boreal or subalpine species not yet confirmed from Italy, Other species not yet confirmed in Italy, XIX Final Remark, XX Bibliography, XXI Iconography, XXII General keys,Taxonomic Index.

Determination keys to all European species in English, German, French and Italian.