I have a Lucky Bamboo plant which has recently started growing a white
mold around the rim of its pot.  Over the past few weeks it has grown
up the stalks of the plant as well.  I boiled the rocks and washed the
sides of the pot, but the fungus keeps returning.  How can I treat the
fungus growth?

The mold is probably on the plant, which is why it comes back after
just cleaning the pot and rocks.  Try cleaning the pot and rocks
again, but this time also soak the plant for up to an hour in some
water that has either a squirt of dishwashing liquid, or some baking
soda (3 tsp/gallon of water) added.

Sources:
http://www.grayenvironmental.com/preventing_mold.htm
http://www.ext.nodak.edu/extnews/hortiscope/houseplnts/misc.htm (about
1/3 of the way down the page)

Method:
Search on "houseplant mold" or "houseplant mold baking soda"