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Aquatic Monocot Stem: Aerenchyma in Potamogeton

cross section: Potamogeton stem

magnification: 100x

 

Berkshire Community College Bioscience Image Library

 

The epidermis is single layered with a thickened outer cell wall, thin to non-existent cuticle and scattered stomata.

 

The cortex consists of two zones of photosynthetic parenchyma; a narrow outer zone of packed parenchyma and a deeper broad zone of web like aerenchyma, interspaced with large radially arranged air pockets. Small bundles of sclerenchyma cells stabilize the intersections between intersecting strands of aerenchyma.

 

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Uploaded on July 16, 2017
Taken on February 10, 2014