I don't seem to be able to collect any of the corrupted mushrooms. I have read all of the posts on this board on the topic and gone to all of the available locations where the mushrooms are supposed to be (Great Cave, Abyss, etc.). I see the tiles with the corrupted mushrooms on the ground (sort of moldy green looking, right?), but I don't get any special messages or special items when I walk on them, and when I use the get screen, there aren't any mushrooms or items around to pick up. What am I doing wrong? Is there a particular order in which you have to retrieve the mushrooms?
Here is a screenshot, in case I'm somehow not finding the right tiles:
http://img84.imageshack.us/img84/6444/mushroomsq.png
Thanks for any help..