You are most eminently correct..
"Major steps in evolution are generally invisible to science, because they occur so rapidly that even the fossil evidence disappears.
To study a major step in evolution as it is occurring is unprecedented in science. The morel produces such a result in a very dramatic way.
It is currently evolving from a yeast to a mushroom.
This means the macro-morphology (large scale structure) of the morel is evolving from scratch.
There is no other known example of macro-morphology originating from a single cell organism in hundreds of millions of years.
Thank you for that informative link.