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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
Not many opportunities to write ‘callipygian’–it’s all Greek to me 😉
What’s in this boll?
Just wood, usually. Unlike galls, they don’t harbor developing critters within. They can be taught of as tumors, irregular growths, often caused by viruses. Or, in the case of burls, they’re actually bud or root tissue growing in the “wrong” place.
Oh, thank you Mthew. Your posts are always interesting.