Underside of a fertile polypody fern frond, Polypodium vulgare, showing a clustering of sori, reproductive structures that contain the spores.

Size: 5207px × 3544px
Photo credit: © DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: botany, fern, ferns, nature, plant, polypodium, polypody, pteridophyte, pteridophytes, reproductive, sorum, sporum, structure, vulgare