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ParenCelElong160.jpg (8033 bytes)

 Parenchyma cells can be elongated. These are from lettuce hypocotyls. There are several superimposed layers in this image. This is a longitudinal Section. These cells look circular in cross-section.

PalisadeCellSS80.jpg (4960 bytes)

 Palisade cells from Hawaiian Silver Sword leaves. Note the large chloroplasts. Photosynthetic Parenchyma can be called Chlorenchyma. This is easier to say that than Photosynthetic Parenchyma. Palisade cells are columnar Chlorenchyma.

ParenBranch2D160.jpg (8531 bytes)

 Parenchyma cells can be branched. These cells branch in 2-Dimensions. Note the thin, translucent primary cell wall (stained with Toluidine Blue).

Stelate2D160.jpg (14006 bytes)

 This is another example of Parenchyma cells that are branched in 2-D (stained with Toluidine Blue). Parenchyma tissue like this, that contains lots of intercellular spaces is called Aerenchyma. Aerenchyma is typically found in leaves and stems of semi-aquatic plants.

StellateParen160.jpg (9182 bytes)

 These Stellate Parenchyma cells are branched in 3-Dimensions. These are form air cavities in Cana petioles (see below). These were stained with Toluidine Blue. Spongy Mesophyll cells in Leaves may be branched in 3-D.

CanaPet160.jpg (21115 bytes)

 Cross-section of Cana petiole. The Stellate Parenchyma reside in the two large air cavities that are seen on the left and right sides of the image.
CyprsIKIMod250.jpg (23709 bytes) This is Aerenchyma from the stem of Papyrus (Cyperus papyrus) stained with IKI. A = Air Space.
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