Young pine tree stem,light micrograph

Bildnummer 11564894
Young pine tree stem,light micrograph
Young pine tree stem. Light micrograph of a transverse section through a two and a half-year-old stem of a pine tree (Pinus sp.). The cells of the outer epidermis (bright red) are thick-walled with a thick covering of cuticle beginning to break up. Beneath the epidermis is a cork cambium (phellogen) which has produced 2-3 layers of cork (orange-brown),to resist forest fires. The vascular cylinder has a thick layer of phloem (pale blue and deep blue) with a layer of cambium (light grey-blue) formed between the phloem and xylem (red). Spring wood consists of large thin-walled cells whilst the autumn wood (last formed) has small thick-walled cells. Since there are three layers of spring wood and two layers of autumn wood the stem is two and a half years old. Magnification: x14 when printed 10 centimetres wide
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Wheeler, Dr. Keith
Bildgröße: 5562 px × 5071 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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