Foto n. 171482 - northern wood fern (Dryopteris expansa)
Credit: Photo by Adriano Bruna - Maniago (PN) - Friuli
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Foto n. 9181 - northern wood fern (Dryopteris expansa)
USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 1: 21.
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