Mycologist

He's a mycologist.

The mycologist went wandering off into the woods.

The need of the mycologist, mycophagist and amateur toadstool student is a book giving the genus, names and descriptions of the prominent American toadstools whose edibility has been tested, or whose poisonous qualities have been discovered.

‘Iʼm not a mycologist but I believe you only get this formation when the fungus is forming reproductive organs.’