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Azolla filiculoides
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Family : Azollaceae
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| Water Fern |
| 8/119 : Alien | |
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This aquatic fern has become rather abundant in the last few years. In 1998 the surface of Barmston Drain was almost completely covered with this plant for several kilometres. It is still present there but much reduced.
| R Middleton 2000 |
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