Polarised light micrograph of a transverse cross section through the stalk of an evening primrose (Oenothera sp.) showing raphides. Raphides are calcium oxalate crystals with needle-like projections. They are a defence mechanism against predators. Magnification: x372 when printed 10 cm wide. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Mis, Marek |
Taille de l’image : | 6544 px × 3985 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |