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Dryopteris expansa (C. Presl) Fraser-Jenkins & Jermy

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
ClassFilicopsida“Leptosporangiate” (has to do with how their spores form) ferns—includes most ferns
OrderPolypodialesPolypod ferns
FamilyDryopteridaceaeWood ferns (about 70% of the ferns)
GenusDryopterisFrom Greek dryas, “oak,” and pteris, “fern,” in reference to the presence of some species of wood ferns in woodland areas populated with oaks

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Dryopteris assimilis S. Walker

Dryopteris dilatata auct. non (Hoffm.) A. Gray

Dryopteris dilatata (Hoffm.) A. Gray ssp. americana (Fisch.) Hultén

Dryopteris spinulosa (O.F. Müll.) Watt var. dilatata auct. non (Hoffm.) Underw.


Dryopteris expansa description by Thomas H. Kent, last updated 28 Jul 2023.

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Dryopteris expansa

9/22/2023 · Goodell Brook Falls, Monson, Maine · ≈ 10 × 6″ (24 × 16 cm)


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