Cystopteris protrusa

Wikipedia description
Cystopteris protrusa is a common fern of North America, commonly known as the lowland bladderfern, lowland brittle fern or lowland fragile fern.
The plant is native to eastern Canada, and the Midwestern and Eastern United States. Throughout much of its range it is the most common Cystopteris fern species.
Scientific classification
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Clade:
Leptosporangiate Monilophytes
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Order:
Polypodiales
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Family:
Cystopteridaceae
Species:
Cystopteris protrusa
Samples