Mixed Polypody (Polypodium mixtum)
The Mixed Polypody is known exclusively by the type that was collected in the 19th century somewhere in Ecuador, an exact locality is not known.
The species was never found since its description and may already be extinct.
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edited: 15.04.2019
Dead as the Dodo – Holocene Extinctions
… about 5692 taxa have disappeared since the beginning of the Anthropocene era (since about 10000 BCE)
