Underside of a fertile polypody fern frond,Polypodium vulgare,showing a clustering of sori,reproductive structures that contain the spores | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 5207 px × 3544 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |