What is the name of the large fungus growths on redwood trees?

Back in the day, my grandpa was a logger up in eureka, and he harvested a large piece of fungus off of one of the trees, and it was made into a coffee table, it looks like wood, but instead of concentric rings, it is all swirls.What is the name of the large fungus growths on redwood trees?
It is a burl. Something damaged the tree. Or perhaps an obstacle of some type caused it to grow in odd directions.


I have caused similar swirl type wood by tying a fir or pine tree trunk top or limb in a knot. It will grow with the grain going in all directions but you have to wait about 10 or 15 years to really get any results.


With some redwoods it may have been started hundreds of years ago.What is the name of the large fungus growths on redwood trees?
toupe rug wigg
Just to be clear, a burl is not a fungus. It's more of a deformity of the tree growing over a damaged area. They build up little buds and can sprout shoots that would eventually become trees. Kinda neat.