spongy parenchyma

Science Dictionary
spongy parenchyma   (spŭn'jē)  Pronunciation Key 
A layer of cells in the interior of leaves, consisting of loosely arranged, irregularly shaped cells that have chloroplasts. The spongy parenchyma has many spaces between cells to facilitate the circulation of air and the exchange of gases. It lies just below the palisade layer. Also called spongy mesophyll. See more at photosynthesis.
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