DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Mistletoe stem. Light micrograph (LM) of a mistletoe (Viscum album) stem in cross-section, showing nine vascular bundles radiating out from the centre of the stem. Each vascular bundle is composed of long fibres (dark crimson), phloem (green) and xylem (pink). The long fibres (sclerenchyma) give the stem support and allow flexibility. In-between, the phloem transports food and the xylem transports water and minerals. The green tissue (parenchyma) around the vascular bundles is for food storage and, when swollen with water, provides extra support. A close-up of one of the vascular bundles can be seen in B725/381.
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