I am banging my head against a wall.  I am attempting to perform the first summoning quest and I have all of the ingredients except for the Kohar root.  The weird part is that my journal states that I have all of the necessary ingredients.  But, after looking through here I have not traded the mushroom to the absent minded imp.  I have the mushroom in my possession and everytime I talk to him about the Kohar root he just says that he wants the mushroom for his flooge frog.  What am I doing wrong?  Shouldn't he give me the Kohar root because I have the mushroom to give him in exchange.  This is driving me nuts.