DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Dandelion root. Light micrograph of a transverse section through a root of a dandelion (Taraxacum officinale). The root has undergone secondary thickening. The inner cork cambium (phellogen) of the periderm has produced 2-3 outer layers of cork cells (red). Below this is the vascular cylinder made up of phloem, parenchyma, cambium and xylem tissues. The large amount of parenchyma in the vascular cylinder is for the storage of food substances such as starch grains. In the centre of the root is the primary proto and metaxylem tissues (red). Magnification: x14 when printed at 10 centimetres wide.
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