We present a detailed nomenclatural analysis of the class names Carpino-Fagetea, Querco-Fagetea, Quercetea robori-sessiliflorae, Quercetea ilicis and Vaccinio-Piceetea. The current literature presents contradictory opinions about the legitimacy and
correct author citation of these names, often motivated by deviating interpretations of the International Code of Phytosociological Nomenclature. This primarily concerns the provisions of Articles 2b, 3j, 3m and 35 which can be interpreted in quite different ways, leading to divergent conclusions
on the validity and legitimacy of a name. Thus, the problems discussed in this paper are of general relevance for phytosociological nomenclature, highlighting the need for amendments and clarifications to be implemented in the next edition of the Code. Moreover, we suggest establishing a formal
procedure to request a binding decision on specific cases to stabilise the interpretation of the Code.