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smaller than a golf ball, paper light, spiked inside
temperate forest, oak
I spotted this on the leaf of a burdock plant. I thought it was a gall at first but it wasn't attached. I've never seen anything like it. It was intact when I found it. I poked the hole in it and was really surprised to see a sharp spiked seedpod. There were no other ones around. It seemed like it fell out of a tree but there were only maples and oaks around, which makes sense after getting the ID.