Canadian Pondweed Leaf
by Dr Keith Wheeler/science Photo Library
Title
Canadian Pondweed Leaf
Artist
Dr Keith Wheeler/science Photo Library
Medium
Photograph - Photograph
Description
Canadian pondweed leaf. Light micrograph of a section through a leaf from a Canadian pondweed (Elodea canadiensis) plant. The centre of the stem has a vascular system (blue) made up of a primitive axial strand that consists of the fusion of several vascular bundles but lacks xylem vessels. It doesn?'t need a strong vascular tissue because the water-pressure supports the stem and the epidermis is permeable to water and mineral salts. The cortex (outer layer) is made up aerenchyma tissue (red) with wide inter-cellar spaces for buoyancy and storing gases e.g. oxygen. The cells within the cortex are full of chloroplasts (red). Magnification: x37 when printed 10 centimetres wide.
Uploaded
September 25th, 2019
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