Apparently the shinbashira, or central pillar, is the key to the longevity of these structures. The central pillar of the Temple of Flourishing Dharma is a tree that was cut down in 594. The wood extends 3 meters into the earth, and planted at the base is a relic believed to be a bone that belonged to Buddha.

Like look at this. The Temple of the Flourishing Dharma (Horiyu-ji). Built in the 7th century. One of the oldest wooden buildings in the world. It has survived earthquakes and fires. How was it built? I don't know because my education thought Europe was the center of everything.

This chart here shows several edible mushrooms and how well they can grow on certain kinds of wood but black locust is not listed.

Chicken of the woods can be prepared in any way you use chicken, and has a similar taste and texture. It can even be fried!