Elm stem (Ulmus procera) cross-section, polarised light micrograph. At centre is the pith (blue), outside of which is a ring of wood (brown/yellow), i

---

Elm stem (Ulmus procera) cross-section, polarised light micrograph. At centre is the pith (blue), outside of which is a ring of wood (brown/yellow), indicating that the stem is one year old. It contains xylem vessels (large holes), which transport water and minerals throughout the plant. The green/red ring is the cambium, and above this is a second woody ring (yellow) containing phloem vessels, which transport carbohydrates and hormones around the plant. The outermost layer is bark, consisting of cork. Magnification: x44 when printed 10 centimetres wide.

---

Size: 5189px × 5408px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: anatomical, anatomy, angiosperm, angiosperms, background, bark, biological, biology, blue, botanical, botany, cell, cells, cork, cortex, cross, cross-section, dicot, dicotyledon, elm, flora, internal, light, micrograph, microscope, nature, phloem, pith, plant, plants, polarised, polarized, procera, section, sectioned, slice, sliced, stem, structure, structures, tissue, tissues, transverse, tree, ulmus, vascular, vessel, vessels, wood, woody, xylem