We have several very mature post oaks. Most of the falling leaves have something pink and fuzzy attached. The pink things are solid (dense), and when broken open are white inside. I saw the image of oak galls in the Library, but those are small and smooth. The stuff on our trees is bigger than a pencil eraser, compact, furry, and a washed-out pink color. It seems almost every leaf has some. What's going on here? I'm not sure yet whether our cedar elms, pecan, or hackberrys have the same pink nodes on them.
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