These strange growths on alder cones are cause by a fungus - Taphrina alni - but they are actually galls. Like the structures produced by gall-wasps, the natural growth of the plant is distorted by the fungus to produce distinctive structures for its benefit.
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| Taphrina alni - alder tongue |
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| Taphrina alni - alder tongue |
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| Taphrina alni - alder tongue |
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| Taphrina alni - alder tongue |
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