New mutations for two association names of forest plant communities

We provide the formal correction of the name-giving taxon for two association names of forest plant communities according to Article 45 of the International Code of Phytosociological Nomenclature. The new mutations are focused on Pino cembrae-Piceetum abietis Myczkowski et Lesiński 1974 (orig.: Cembro-Piceetum Myczkowski et Lesiński 1974 ) and Thelypterido palustris-Alnetum glutinosae Klika 1940 (orig.: Alnus glutinosa - Dryopteris thelypteris -Assoziation Klika 1940 ).