Stomata on epidermis of an ash leaf

Stomata on epidermis of an ash leaf

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Caption: Light micrograph of the surface of the leaf of the ash tree, Fraxinus excelsior, showing stomata (oval bodies) and part of the vascular system (band of elongated cells, bottom). 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 and widen the pore. During the night or at times of drought the guard cells become flaccid and the stoma closes. Magnification: x400 at 35mm size.

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

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