Images Dated 19th December 2002
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Choose from 21 pictures in our Images Dated 19th December 2002 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery.
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Sori on a fern leaf, Polystichum
Fern sori. Coloured scanning electron micrograph (SEM) of two sectioned sori" (spore containing structures) on a leaf of the male fern Polystichum filix-mas. Sori consist of clusters of sporangia (brown, stalked). Each sporangium contains many spores (tiny spheres). When the spores are ready for release, the indusium (pale green) covering each cluster of sporangia uncurls in dry conditions. This drying also occurs in the wall of the sporangium which eventually, due to tension, splits and catapults spores away from the plant. Spores germinate on the ground to form the prothallus of a new fern plant. Magnification: x2 at 5x7cm size. Magnification: x5 at 3x7 inch print size."
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