Male fern frond (Dryopteris felix-mas). The fronds show pinnate formation, that is they have a long central midrib, or rachis, with frondlets arranged

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Male fern frond (Dryopteris felix-mas). The fronds show pinnate formation, that is they have a long central midrib, or rachis, with frondlets arranged in parallel pairs along it.

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Size: 5320px × 3438px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: american, ancient, biological, biology, botanical, botany, dryopteris, felix-mas, fern, formation, frond, leaf, leaflet, leaflets, leaves, male, midrib, nature, pinnate, plant, primitive, pteridophyte, pteridophytes, rachis