Pine stem. Light micrograph of a section through the stem of a 14-year-old pine (Pinus sp.) tree. From outer to inwards: outer layer of cork (brown);
Pine stem. Light micrograph of a section through the stem of a 14-year-old pine (Pinus sp.) tree. From outer to inwards: outer layer of cork (brown); cortex - made up of parenchyma cells (red) with resin canals; ring of secondary phloem composed of sieve cells (blue), parenchyma and albuminous cells (red); vascular cambium cells (blue); xylem - with fourteen growth rings each made up of large thin-walled tracheid cells (light pink) of spring wood, and smaller thick-walled tracheid cells (dark pink) of autumn wood; thin files of parenchyma and tracheid cells (brown). The xylem includes large circular resin canals (lacunae, blue). Magnification: x3 when printed 10 centimetres wide.
Size: 5125px × 3417px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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