DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Sage stem. Light micrograph of a section through a secondary stem of a scarlet sage (Salivia splendens) plant. The outer stem is covered with a thin epidermis and thick cuticle (red), but is thicker at the four corners forming cork (brown). It also contains stomata, and trichomes. Under the epidermis, at the corners, is a layer of flexible collenchyma (dark red) for support. Next is the cortex (red), with an inner pericycle of parenchyma tissue (brown). Next, the vascular bundles (green) consist or rings an outer layer of phloem (dark red) and inner xylem (green and brown) tissue, with cambium tissue (light red) in-between. At the centre of the stem is a pith (red) of parenchyma. Magnification: x5 when printed 10 centimetres wide.
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