""'Polypodium " "'is a genus of 75 100 species of true ferns, widely distributed throughout the world, with the highest species diversity in the tropics.
22.
Correll and Correll, two authors responsible for thirty years of classification since Flora was introduced in 1982, documented " Phlebodium aureum " as " Polypodium aureum " as recently as 1982.
23.
In 1810, the species originally appeared in scientific literature as " Polypodium confluens " in the " Prodromus Florae Novae Hollandiae ", authored by the prolific Scottish botanist, Robert Brown.
24.
Evans et al . ( 2008 ) have performed phylogenetic analyses of metazoans with 18S and partial 28S rDNA sequences in a large dataset that includes " Polypodium " and a comprehensive sampling of cnidarian taxa.
25.
In addition, there exists a weird cnidarian parasite, " Polypodium hydriforme ", which lives inside its host's class Polypodiozoa and this view is often seen to reflect the uncertainties surrounding this highly distinct animal.
26.
The genus is closely related to " Polypodium ", and many of the species have been or sometimes are still included in that genus; further changes in the circumscription of the genus are expected as research continues.
27.
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.
28.
This aspect of the plant has caused it in the past to be placed, at first, in the genus " Polypodium ", then grouped with genus " Dryopteris ", then with the genus " Thelypteris ".
29.
However, molecular phylogenetic studies using 18S rDNA sequence data have challenged this interpretation, and have indicated that " Polypodium " is a close relative to myxozoans and that together they share a closer affinity to bilaterians than cnidarians ( Zrzav?& Hypaa 2003 ).
30.
The only other reasonably convincing fossil remains of drynarioids aside from " D . callispora " was a specimen named " Polypodium quercifolia " recovered in 1985 from the Late Miocene ( 23.03 to 5.332 million years ago ) of Palembang, Indonesia.
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