Yew stomata. Coloured scanning electron micrograph (SEM) of stomata (holes) on the surface of the leaf of an English yew (Taxus baccata). Stomata are holes which regulate gas and water exchange between the leaf and the atmosphere. During the day they open to allow the exchange of gases during photosynthesis, closing at night to prevent water loss. They are opened and closed by two bordering guard cells (not seen) below this top layer. This yew is a long-lived poisonous tree which inhabits cool, hilly areas throughout Europe and northern Asia. Magnification: x375 at 6x7cm size. x580 at 4x5 inch size. | |
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