"Polypodium sibiricum " is also now known to be one of the parents of the allotetraploid " Polypodium vulgare ", along with " Polypodium glycyrrhiza ".
2.
For years, " P . virginianum "-- long considered a variety of the British " Polypodium vulgare "-- was recognized as having cryptic races, with diploid, triploid, and tetraploid representatives.
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