Pine stem. Polarised light micrograph of a section through part of the stem of a pine (Pinus sp.) tree, showing the growth rings. From outer to inward
Pine stem. Polarised light micrograph of a section through part of the stem of a pine (Pinus sp.) tree, showing the growth rings. 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 ten growth rings each made up of large thin-walled tracheid cells (light brown) of spring wood, and smaller thick-walled tracheid cells (dark brown) of autumn wood; thin files of parenchyma and tracheid cells (brown). The xylem includes large circular resin canals (lacunae, green) Magnification: x13 when printed 10 centimetres wide.
Size: 3829px × 4564px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: albuminous, autumn, background, biological, biology, botanical, botany, cambium, canal, canals, cell, cells, close-, cork, cortex, cut, cut-, cut-outs, cutout, cutouts, cytological, cytology, detail, duct, ducts, growth, gymnosperm, gymnosperms, histological, histology, lacuna, lacunae, light, micrograph, microscope, microscopy, parenchyma, phloem, pine, pinus, plant, plants, polarised, resin, ring, rings, secondary, section, sectioned, sieve, sp., spring, stain, stained, stem, structural, structure, structures, tissue, tracheid, tracheids, tree, trunk, tube, tubes, vascular, white, wood, xylem
