Pine needle, light micrograph

Numéro d’image : 13386706
Pine needle, light micrograph
Fluorescence light micrograph of a section through a pine (Pinus sp.) needle. The centre of the needle is occupied by two vascular bundles (butterfly-shaped region, centre), each one made up of xylem (red and black) and phloem (blue) tissue. These are surrounded by a thick pericycle (large-celled region) and a layer of endodermis (necklace-like ring of large cells). The tissue surrounding the endodermis is known as mesophyll (green and brown speckled layer), which contain the resin ducts (not seen). In the epidermis (surface) are stomata (openings) for gas exchange.
Licence : Droits gérés
Crédit: Science Photo Library / Fox, Frank
Taille de l’image : 6702 px × 7415 px
Model Release : Non requis
Property Release : Non requis
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