Cedar-Apple Rust

Are these galls harmful to the tree?

Hi Steve! I have moved this to fungi for you as the gall is caused by a fungus.

Great spot! A gall firework, primed and ready to go off! Now you know what you're looking at when it gets REALLY strange.

Makita, I love your blog. Sounds like your kids are getting a great education.

Here's a more extensive explanation: http://pods.dasnr.okstate.edu/docushare/...

You should link this to the Symbiotic Relationships Mission: http://www.projectnoah.org/missions/7987...

I think I found your answer:
http://teapotshappen.com/2009/09/29/ceda...

We recently studied galls ourselves and wrote a post about it here:
http://academiacelestia.blogspot.com/201...

Looks like some kind of Gall maybe?? Galls are out growths on trees caused by some kind of infection or parasite http://en.wikipedia.org/wiki/Gall

My students found this out on the playground. Can you help us identify it??