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Trentepohlia alga, growing on oak tree in bluebell wood. I wanted to show both the alga, and the habitat in which it was growing, so I used a wide-angle lens. Nikon D300 with Sigma 10–20 mm lens, set to 13 mm. image sec @ f/11.

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Ultraviolet fluorescence. Many substances, from minerals and insects, to ink and paint, glow (or fluoresce) when lit by ultraviolet light. The effect is widely used in the security industry for checking bank notes and “invisible” ...

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