"Wow" is right. "WoW" to be more precise. That's where I think I've seen giant mushrooms before, in a place called Zangarmarsh.
If I could, I think I'd slap you. Morrowind, The Elder Scrills III came out on May 2nd, 2002. World of Warcraft came out on November 23, 2004. Know how I know? I was alive for both of them, and I know how to use Google. Took me 30 seconds to find an exact date. Morrowind did giant mushrooms more than two years before WoW, which is a massively inferior game anyway. Your welcome, for the schooling. =)