Pine stem. Light micrograph of a section through the stem of a pine (Pinus sp.) tree, showing tracheid cells (white-brown) in the xylem tissue. There

---

Pine stem. Light micrograph of a section through the stem of a pine (Pinus sp.) tree, showing tracheid cells (white-brown) in the xylem tissue. There are thin files of parenchyma and tracheid cells (orange-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: x70 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, parenchyma, pine, pinus, pit, pits, plant, plants, ray, rays, ring, section, sectioned, sp., spring, stain, stained, stem, structural, structure, structures, subsidiary, tissue, torus, tracheid, tracheids, tree, trunk, vessel, vessels, wood, xylem