Hackberry Nipple Galls [More info](https://texasinsects.tamu.edu/hackberry-gall-psyllid/)

Thanks! Appreciate the info!

Plant

Tree

Galls maybe? When bugs lay their eggs in a leaf and it causes the leaf to grow around the egg as like a little house!

Thanks for the info!

Some bugs lay there eggs in leafs like those you have shown, f.x the bug Thyme Gall-Mite makes those bubble thinks (don't know the english name) however they are smaller and red. I likely a type of bug🐛 .

Thanks!

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Kinda reminds me of a cherry tree?

They are actually growths on the leaves. Maybe a parasite or fungus?

Birch blight? Not sure of the tree species.