Poranthera alpina has been placed in the monospecific genus Oreoporanthera by some authors, but in 2007, a molecular phylogenetic analysis of matK and ITS sequences showed this species to be embedded in Poranthera.
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Study of the internal transcribed spacer region (ITS) of nuclear ribosomal DNA, combined with morphological data, have yielded a better-resolved phylogenetic hypothesis, confirming the distinctiveness of the above-named genera.
Norwegian mycologist Gro Gulden and colleagues concluded that all five represented the same species after comparing the DNA sequences of the internal transcribed spacer region of ribosomal DNA for various North American and European specimens in Galerina section Naucoriopsis.