DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Collenchyma plant cells. Light micrograph of a transverse section through collenchyma tissue in the outer stem of a common nettle (Urtica dioica). The collenchyma cell walls are thickened with cellulose (red-orange) so that the center (lumen) of the cell is circular, as seen in this cross-section. The cavity (lumen) contains protoplasm and sometimes structures called chloroplasts. Collenchyma gives support and elasticity to the growing stem, when it is still elongating. Magnification: x100 when printed at 10 centimetres high.
Model release not required. Property release not required.