Merck Manual

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Bracken fern ( Pteridium aquilinum ) with inset
Bracken fern ( <i >Pteridium aquilinum</i> ) with inset
Bracken fern ( Pteridium aquilinum ) with inset

Bracken fern, growing from large, dense, woody rhizomes, forms deciduous, stipitate, erect to spreading fronds with nonanastomosing veins. The pinnae are stalked, opposite or subopposite (inset).

Courtesy of Dr. Bryan Stegelmeier.