DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Plasmodesma plant cells. Light micrograph of a transverse section through intracellular bridges (plasmodema cell) in the fruit of a strychnine plant (Strychnos nux-vomica). The thick-walled cells of the endosperm of this plant's fruit (nut) have black lines traversing the cell walls of interconnected cells. These lines are tubes called plasmodesma. The plasma membranes of adjacent cells pass through this channel, and these connect with one another, allowing substances to pass from one cell to another. Magnification: x230 when printed at 10 centimetres wide.
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