If it isn't a fungus what is it, please?
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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I was alway's told they were called bur's and occour on most broad leaved tree's.It may be a virus that does it,but I know wood turner's like them as you get a unusual grain in the wood.There is a brillent one near me on a Ash tree.
I think sometimes these growths are the result of a reaction to a pathogen, but they are solid wood, so certainly not a fungus or anything like that. They are more like a cancer than anything, but in plants such growths do not have the devastating consequences that they have in animals.
University of Edinburgh and Biodiversity Observatory (OU)
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