Hydrashroom

Named accurately, this mushroom is generally seen with many branching stalks, almost appearing like a tree. They have one main base that the other stalks sprout from, growing smaller and smaller the further it branches. The purple cap with blue spots can be considered pretty, but what the mushroom is known for is... less so. As its name implies, whenever a branch is plucked from a Hydrashroom, or the mushroom itself knocked over, two more mushrooms sprout in its place. The Hydrashroom can grow up to 6 branches naturally, not counting the main branch, so once the branches are knocked off and the duplications begin, things can get... crazy, fast. Hydrashrooms have been documented duplicating as many as 20 times, but are rumored to be able to go even higher than that! These mushrooms can easily get very tall or cover a decent sized area. They'd be a wonderful source of food, if only they didn't taste so bad.

Can I grow them?
Very easily. They're easily planted and easily spread.

Can I eat them?
Yes, you can, but it's not recommended. They have an awful bitter taste and aren't any better cooked.