I didn't intend for them all to be representatives of a single species but I love the idea! Here's a rough list of what I referenced as I was drawing them: Parasols, Honey Fungus, Enoki, Bleeding Tooth Fungus, Bridal Veil, Inky Caps, Blue Pinkgill, Wood Blewit, Chanterelle, Fly Agaric, Morchella.
I think some of them could be colored in one way or another to represent a different real world mushroom. Can't wait to see what you come up with if you do use em!