Iris Cohen schreef
I was writing mainly about American mistletoe.

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Likely the original poster was too, but perhaps not. Who knows?
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a hemiparasite

What makes it a hemiparasite? The fact that it does have green leaves? I
understand it will still weaken a tree if there are too many of them.
Iris,

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Sure it will weaken a tree.
But actually epiphytes can kill a tree too, if there are too many of them.
Epiphytes dont parasitize at all.
PvR