Mushroom Dragon (Water+Plant+Earth)

Mushroom Dragons are very mysterious type of dragon. It is said that it was to dangerous to keep them in your park because they have a slimy poisonous coating on their back. So wizards came up with a magical solution to keep the toxic slime off their back and have them safe to view in parks. Keeping many of them in your park may cause psychedelic effect.

http://dragonvale.wikia.com/wiki/User\_blog:SixthLeafClover/Mushroom\_Dragons