Orig. (K. Mráz 1959): Piceo-Alnetum (Picea excelsa=Picea abies, Alnus glutinosa)
Syn.: Piceo-Alnetum Rubner 1954 (§ 2b, nomen nudum), Piceo-Alnetum Rubner in Oberdorfer 1957 (§ 2b, nomen nudum)
Formal definition: (Alnus glutinosa cover > 25 % OR Alnus incana cover > 25 %) AND (group Vaccinium myrtillus OR group Viola palustris) NOT group Carex acuta NOT group Carex elongata NOT group Carex rostrata NOT group Lysimachia vulgaris NOT group Urtica dioica NOT Pinus sylvestris cover > 5 %