Water-lily Leaf Stem
by Dr Keith Wheeler/science Photo Library
Title
Water-lily Leaf Stem
Artist
Dr Keith Wheeler/science Photo Library
Medium
Photograph - Photograph
Description
Water-lily leaf stem. Light micrograph of a cross- section through the leaf stem (petiole) of a white water-lily (Nymphaea alba). This shows the air canals (empty spaces, blue) in the tissue, which make the water-lily buoyant. This type of air- filled tissue is known as aerenchyma, and also improves respiration and photosynthesis. The air spaces are lined by thick wall cells, called sclereids, that have an irregular shape.
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November 21st, 2019
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