A Slimy Situation

This poor fellow here barely escaped Bloodvenom Post with his life! If we're going to keep him from turning into a slime creature like all the others, we've got to treat the infection. Mushrooms like to grow near the bright green waters around here, like the pond to the east beneath the falls. Most of them are no good... I need you to collect the bright green glowing ones! If I have those, I'll be able to whip up something tasty to help this poor tauren. Don't take too long now!