Light micrograph of a cross section through a pine (Pinus subgenus Pinus) needle, or leaf. The outer epidermal layer is covered by a thin cuticle (pale blue). Regularly spaced stomata are present on both the upper and lower surfaces of the leaf. A ring of 12 evenly spaced resin canals are located within the mesophyll layer. A layer of endodermis surrounds transfusional tissue, which in turn contains two vascular bundles composed of phloem (lower layer of smaller cells) and xylem (upper layer). Magnification: x40 at 10cm wide. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Lowry, Steve |
Taille de l’image : | 6289 px × 3862 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |