Tags: Fern.
Eupolypods I is a clade of ferns in the order Polypodiales class Polypodiopsida. It probably diverged from Eupolypods II during the mid-Cretaceous. The divergence is supported by both molecular data and an often overlooked morphological characteristic which lies in the vasculature of the petiole. Most species that make up the Eupolypods I clade have three vascular bundles. The only exceptions are the Grammitid ferns which have one and the genus Hypodematium which has two.
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