I'm sure you're surprised to know that such an occupation exists!! A "fungus doctor".
We required his knowledge recently. My daughter noticed this very interesting fungus growing at the base of our retainer wall of our new extension. My son took a photo of it and wondered if his uncle would know what it is, who knows a lot of our native flora and trees, also does dieback mapping in the jarrah forrest here. However, he hadn't seen it before, so told my son that we'd need to send the photo to the "fungus doctor".
Here is a photo of it:
And this is what it is called: a cup fungus, Aleuria rhenana or the stalked orange peel fungus. The "fungus doctor" commented that it was a nice photo.