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How did molecular evidence change the classification of fungi?
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fungus
A pair of panther cap mushrooms (Amanita pantherina). Closely related to the death cap mushroom (Amanita phalloides), the panther cap is highly poisonous.
Molecular evidence has fundamentally transformed fungal classification by shifting the focus from traditional morphological traitsāsuch as sexual organ structure and hyphal septationāto phylogenetic relationships based on ancestral lineages.1
Beginning in the 1990s, analyses of ribosomal RNA and protein-coding gene sequences allowed scientists to correct historical misplacements. This molecular approach has had two major impacts:1
- Exclusion of non-fungi: Many organisms previously grouped with fungi were reclassified. For example, water molds were moved to the kingdom Chromista, while certain parasitic organisms like the Amoebidales were identified as protozoan animals.1
- Inclusion of new members: Molecular data revealed that organisms once thought to be unrelated are actually fungi. Notably, Microsporidia, previously considered unique protozoa, and Hyaloraphidium curvatum, formerly classified as a green alga, are now recognized as members of the kingdom Fungi.1
Furthermore, molecular studies have led to the dissolution of outmoded taxons, such as the phylum Zygomycota, and the establishment of new phyla like Blastocladiomycota and Neocallimastigomycota, ensuring that modern classification reflects true evolutionary history.2