What kind of stump? Chaga is an interesting medicinal fungi species that grows mostly on weak or dead birch trees - it is a black gooey mess somewhat like what you show. Chaga was also important for to early fire monkeys as it makes a good tinder.
Normally trees don't drive trucks. Does this tiny ad have a license?
permaculture thorns, A Book About Trying to Build Permaculture Community - draft eBook