55.5 MB (2.4 MB compressed)
5747 x 3378 pixels
48.8 x 28.7 cm ⏐ 19.2 x 11.3 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
White oak leaf. Light micrograph of a section through the midrib of a leaf from a white oak (Quercus alba) tree. This is a typical mesophyte leaf micrograph upper and lower epidermal layers (red-blue), a cuticle and typical stomata, found only on the lower surface. Under the upper epidermis are two layers of palisade mesophyll (red-violet) with chloroplasts. Beneath this is spongy mesophyll (red) with chloroplasts and large inter-cellular spaces. In the middle of the lamina is the midrib, carrying three large veins surrounded by parenchyma (violet), which are themselves surrounded by fibre/sclerenchyma (pink). Inside the top of the veins is the xylem (pink) with large tracheid cells. The lower veins are the phloem, with sieve tubes (small dark blue.
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