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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Young, Archie |
Bildgröße: | 5125 px × 3440 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |