Ash leaf epidermis

Ash leaf epidermis

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Caption: Light micrograph of the surface of a leaf from an ash tree, Fraxinus excelsior, showing stomata embedded in the epidermis and part of the vascular system (the branching 'river' of larger cells). 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 draught the guard cells become flaccid and the stoma closes. Magnification: x100 at 35mm size.

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

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