[JRandomFreeper]

You sent me this picture. What the heck is it?

/johnny

[GeronL]

That is a very good question

[Eric in the Ozarks]

It’s a collection of galls.

Mites or small wasps deposit eggs in the leaves of trees or vines. The “deposit” contains food for the egg.

The leaf reacts to these deposits by walling off the eggs with these “bumps.”

Brown bumps on oak leaves are more common. This is the first time I’ve seen little red horns like this.