Biology, any type of plant/botany class.
Also - not a college class but check out facebook pages or if you have a nature center or something in your area. I took a mushroom cultivation class at my local nature center. It was only a day long but we got a small oyster mushroom grow and it was super informational. There's also a fungus festival in my area once a year so maybe see if there's something like that to get connected/more info on classes.
Mycologos offers classes as well I think, but I don't know a ton about them.
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