Help with diagnosis

Asked May 20, 2016, 12:13 PM EDT

I'm wondering if you can tell me what this is. It looks to be some type of gall perhaps but I've never seen one with such bright orange color. It's very hard, not spongy at all, and about 2 inches in diameter but eventually grows quite large. They don't grow in clusters but individually on branches. Tree is loaded with them.

Wadena County Minnesota

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