54.9 MB (3.8 MB compressed)
5028 x 3815 pixels
42.7 x 32.3 cm ⏐ 16.8 x 12.7 in (300dpi)
DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Medlar leaf. Light micrograph of a section through the midrib of a leaf from a medlar (Mespilus germanica) plant. This is a typical mesophyte leaf with an upper and lower epidermis (red), with trichomes (hairs), a thick cuticle (blue) and typical stomata (pores), found only on the lower surface. Under the upper epidermis are two layers of palisade mesophyll (red), with chloroplasts. Beneath this is a spongy mesophyll (blue-red) with chloroplasts and large intercellular spaces. In the middle of the lamina are small leaf veins (red-blue) and a single large vein (the horseshoe midrib) with thick-walled collenchyma (black-blue) and a ring of parenchyma (blue). Within the horseshoe ring the top is the xylem (red) with large tracheid cells. Under the xylem is.
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