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The Epic Interactive Encyclopedia 1997
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mesophyll
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1992-09-02
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16 lines
The tissue between the upper and lower
epidermis of a leaf blade (lamina),
consisting of parenchyma-like cells
containing numerous chloroplasts. In many
plants mesophyll is divided into two distinct
layers. The palisade mesophyll is usually
just below the upper epidermis and is
composed of regular layers of elongated
cells. Lying below them is the spongy
mesophyll, composed of loosely arranged cells
of irregular shape. This layer contains fewer
chloroplasts and has many intercellular
spaces for the diffusion of gases (required
for respiration and photosynthesis), linked
to the outside by means of stomata.