Stomata and vein in ash leaf

Stomata and vein in ash leaf

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Caption: Light micrograph of the surface of the leaf of the ash tree, Fraxinus excelsior, showing part of the vascular system (branching 'river' of elongated cells) & numerous stomata (tiny oval bodies). Stomata are breathing pores which regulate the exchange of gases between the leaf's interior & the atmosphere. Each stoma is controlled by the water content within a pair of cells flanking its central pore. The arrangement is such that when these guard cells increase in turgidity, their inner walls bow away from each other & widen the pore. During the night, or at times of drought, the guard cells become flaccid & the stoma closes. Magnification: x200 at 35mm size.

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Keywords: ash, botany, fraxinus excelsior, leaf, leaf epidermis, leaves, light micrograph, nature, plant, plants, stoma

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