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Azolla filiculoides on the River Witham | by Charlie@LincsBeetles
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Azolla filiculoides on the River Witham

This is Azolla filiculoides, an invasive water fern from North America. The azolla weevil, Stenopelmus rufinasus, was also - unsurprisingly - found here. It's the same species which the Environment Agency has recently released on the River Till to tackle the weed.

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Taken on October 29, 2011