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Slime mould spores. Coloured scanning electron micrograph (SEM) of the surface of a fruiting body (sporangium) of the slime mould Metatrichia floriformis. The spores (orange) are found among a mass of thread-like structures (grey), collectively known as the capillitium. Changing moisture levels cause the threads to move with a wriggling action; this flicks the spores away, helping them to be dispersed. Slime moulds are not fungi, but a separate group with a variety of complex life cycles. Magnification: x80 at 6x6cm size.
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