Arnica pollen grains on stigma, SEM

Numéro d’image : 12525970
Arnica pollen grains on stigma, SEM
Arnica pollen grains on stigma. Coloured scanning electron micrograph (SEM) of pollen grains (grey) on the stigma (yellow) of an arnica (Arnica montana) flower. The stigma is the top part of the flower's female reproductive structure (carpel). Pollen grains land on the stigma and grow pollen tubes (centre right) to enable the male sex cells to reach the ovary (not seen) where they fertilize the female sex cells (ovules). Arnica is a member of the daisy family (Asteraceae) and is found in mountainous regions of Europe. The flower is used in herbal medicine to aid healing, control bleeding and to benefit the heart. Magnification: x320 when printed 10cm wide.
Licence : Droits gérés
Crédit: Science Photo Library / EYE OF SCIENCE
Taille de l’image : 4000 px × 3293 px
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Property Release : Non requis
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