According to the International Code of Phytosociological Nomenclature, a younger name of a syntaxon may be conserved against its older name to improve the stability of the nomenclature and avoid misunderstandings in scientific communication. Here, we propose conserving the name Philonotidion seriataeHinterlang 1992 for arctic-alpine, bryophyte-dominated, non-calcareous spring vegetation against the names Cardamino-MontionBraun-Blanquet 1925, Cardamino-MontionBraun-Blanquet 1926, and MontionMaas 1959. In current vegetation classification systems, the two name-giving taxa of Cardamino-Montion no longer indicate the character of the vegetation corresponding to the nomenclatural type of this alliance and are instead characteristic of other currently distinguished alliances. Maintaining the oldest name Cardamino-Montion in strict adherence to the Code would be a source of errors. In the current vegetation classification systems, two similar but counter-intuitive names would then have to be used: Cardamino-Montion for arctic-alpine springs (although the name-giving taxa are more indicative of montane springs) and Epilobio nutantis-Montion for montane springs (although the name-giving taxon Epilobium nutans is indicative of arctic-alpine vegetation). Hence, there is a risk that the name Cardamino-Montion may gradually become ambiguous. We also propose conserving the name Philonotidion seriatae against Mniobryo-Epilobion hornemanniiNordhagen 1943 to prevent confusion in case of a merger of these alliances.<br> (36) Philonotidion seriataeHinterlang 1992<br> Typus: Cratoneuro-PhilonotidetumGeissler 1976 (holotypus)<br> (=) Cardamino-MontionBraun-Blanquet 1925<br> Typus: Bryetum schleicheriBraun-Blanquet 1925 [≡ Montio fontanae-Bryetum schleicheriBraun-Blanquet 1925 nom. corr. et invers. (alternative name)] (holotypus)<br> (=) Cardamino-MontionBraun-Blanquet 1926 nom. superfl. [≡ Cardamino-MontionBraun-Blanquet 1925]<br> (=) Mniobryo-Epilobion hornemanniiNordhagen 1943<br> Typus: Mniobryo-Epilobietum hornemanniiNordhagen 1943 (lectotypus selected by Zechmeister & Mucina 1994)<br> (=) MontionMaas 1959 nom. superfl. [≡ Cardamino-MontionBraun-Blanquet 1925]<br> Taxonomic reference: Euro+Med PlantBase (http://europlusmed.org; accessed 4 January 2024)
