Pine stem. Light micrograph of a section through a single annual growth ring in the stem of a pine (Pinus sp.) tree, showing xylem tissue. The large t
Pine stem. Light micrograph of a section through a single annual growth ring in the stem of a pine (Pinus sp.) tree, showing xylem tissue. The large thin-walled tracheid cells (white-brown) are of younger spring wood (right of image), whilst smaller thick-walled tracheid cells (also white-brown) are of older autumn wood (left of image). There are thin files of parenchyma and tracheid cells (yellow-white) of the subsidiary medullary rays, which pass food substances radially. Many of the tracheid cell walls have bordered pits (circles) that pass water and minerals side-ways. Magnification: x37 when printed 10 centimetres wide.
Size: 5125px × 3417px
Photo credit: © DR KEITH WHEELER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: autumn, biological, biology, bordered, botanical, botany, cell, cells, close-, cytological, cytology, detail, growing, growth, gymnosperm, gymnosperms, histological, histology, light, medullary, micrograph, microscope, microscopy, older, parenchyma, pine, pinus, pit, pits, plant, plants, ray, rays, ring, section, sectioned, sp., spring, stain, stained, stem, structural, structure, structures, subsidiary, thick-walled, thin-walled, tissue, torus, tracheid, tracheids, tree, trunk, vessel, vessels, wood, xylem, young, younger
