It's a little hard to tell, but they might be Lepiota lutea, aka flower pot parasols. Check out this link...
http://botit.botany.wisc.edu/toms_fungi/feb2002.html posted by shrabster at 1:26 PM on September 1, 2008
That's probably Lepiota lutea, a mushroom commonly found in potting mix. It's harmless to your plant. posted by acrasis at 3:40 PM on September 1, 2008
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http://botit.botany.wisc.edu/toms_fungi/feb2002.html
posted by shrabster at 1:26 PM on September 1, 2008