Possible Duplicate:
Should I be concerned about mushrooms in my lawn?
Every time I mow my lawn, I find a few of these bulbs of fungus.
Sometimes they are brown like in the picture I took and sometimes they are more white and smooth looking. I usually just scoop them up and throw them away. When I manipulate them they generally throw a bunch of "dust" around which I assume are spoors that are spreading them potentially. They are always on one side of the house which I'm guessing has some decaying matter in it due to a neighbor's pear tree. Other than getting rid of the pears when I see them, is there anything I can do to stop these things from growing? Are they particularly dangerous to the lawn? Are they going to keep spreading? And what the heck are they anyways?