Anybody know mushrooms?

Here's my beautiful fern. I'm so proud of it -- my mother cut her fern into 3 chunks and gave one to me, several years ago. Finally, this year, it's thriving.
But, hidden beneath all that fine greenery, my fern has some secrets. Here they are:
Anybody know what kind of mushrooms these are? They're very persistent. I pick them and throw them away, and they come right back.