What is this growth on the leaves of my alder tree?

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    gailgail
    Greenhorn
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    I’ve been seeing this for a while now, anybody have any idea what it is? is it dangerous? is it a disease? These lumps on the leaves seem to be clustered on nearby leaves in different parts of the tree.

    DSC04748

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    joliegojoliego
    Greenhorn
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    Did you try cutting one open? Maybe it’s one of those bugs that lays eggs inside and then it makes that ball of stuff, I forgot how it’s called.

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