Section through white dead nettle stem

Section through white dead nettle stem

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY.

Caption: Scanning electron micrograph (SEM) of a cross section through a white dead nettle stem, Lamium album. The stem is square with the vascular bundles (xylem & pholem,liquid conducting vessels) halfway inside each corner. The tissue immediately inside the square corners is the collenchyma, a strengthening layer with thick primary walls. A band of collenchyma (linking the vascular bundles) forms a near continuous layer around the stem, separating the cortex (outer) from the pith (inner). The pith consists of large empty cells, which degenerate as the stem grows, giving rise to the central cavity. Pith cells are thin walled with air spaces between them. Mag: X55 (10x8).

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Keywords: botany, collenchyma, cortex, lamium album, nature, nettle dead whit, pith, plant, plants, scanning electron micrograph, sem, type, vascular bundle, xylem

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