I've just been having an idle flick through a copy of Complete Guide to British Wild Flowers by Paul Sterry and I'm here to remind you that common plant names are wild. You probably know that already (Love Lies Bleeding, Fat Hen, Deadly Nightshade, etc), but there are so many more:
There's a lovely folklore/fantasy vibe going on here and none of these names would be out of place in a Tolkien/Prachett-style fantasy world. I particuarly like Melancholy Thistle (Eeyore's thistle of choice), Sticky Mouse-ear (another job for Supervet) Petty Spurge (really needs to get a sense of proprtion) and Toad Rush (OK, obviously a reed, but also probably a classic Sega video game).
Sterry's book is about flowers, not fungi, but don't even get me started on popular fungus names - the Destroying Angel alone is metal enough to tell you that there are some fungi you really, really don't want to mess with.