Scots pine (Pinus sylvestris) old stem. Light micrograph of a section through a stem from a Scots pine tree,showing remains of the epidermis and cuticle,with the cork cambium and developing cork (brown),phellogen and phelloderm. From outside in: cortex of parenchyma cells,consisting of scattered large resin canals (red) and small resin canals (blue); ring of secondary phloem composed of sieve tube cells (blue-black) and albuminous cells; under the phloem is a ring of vascular cambium; secondary xylem (brown),composed large tracheid cells and parenchyma cells; primary xylem,consisting of metaxylem and protoxylem; pith (centre) composed of parenchyma cells; principal and subsidiary medullary rays (blue). The annual growth rings of autumn wood (small | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Wheeler, Dr. Keith |
Bildgröße: | 4923 px × 3938 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |