Can you identify this toadstool for me?

When I was watering my houseplants this morning I found 2 little toadstools growing in my small orange tree pot. They are about 1 inch tall, larger at the base than the stem and they have a ring around midway up the stem. They are a pale yellow. Anyone know what these guys are. They're really cute. Why did... show more When I was watering my houseplants this morning I found 2 little toadstools growing in my small orange tree pot. They are about 1 inch tall, larger at the base than the stem and they have a ring around midway up the stem. They are a pale yellow. Anyone know what these guys are. They're really cute. Why did they come up all os a sudden like that. I've had this tree for about 2 years.
Update: geisha girl - no they don"t look like your picture, they aren't clustered like that and they are flatter on top.
Update 2: I moved the pot and now they are drooping!
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