That weird fungus

It's back, and it opened up this time:


I've been getting them out while they're still really small, but apparently this one grew and opened up quickly.

It's in a pot! How am I going to get rid of it?


And why am I putting up pictures of a weird fungus when I still haven't put up the Oregon pictures? Because there are just 2 fungus pictures, and over 300 Oregon photos! Ack!