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Q&A What could cause trees to grow large, hollow bulges about halfway up their trunks?

I'd like to have a forest with trees that are "normal" except that as they grow a big, hollow bulge forms in their trunks about halfway up, giving them a shape something like this, with a relativel...

6 answers  ·  posted 6y ago by nanoguy‭  ·  last activity 6y ago by nanoguy‭

Question biology flora