Fertile fern fronds. Collection of various species of fern,upturned to reveal the sori. Left to right: polypody (Polypodium vulgare),male fern (Dryptoteris filix-mas),Hart's tongue (Asplenium scolopendrium) intermediate polypody (Polypodium interjectum) and polypody (Polypody vulgare). Sori are collections of sporangia,which are casings in in which the spores are produced | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Young, Archie |
Taille de l’image : | 5125 px × 3440 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |