Ask-a-Dave's-Gardener: Mysterious growth on Moose Antler Fern, 1 by Jquinones1983

Jquinones1983 wrote:
I have a Moose Antler Fern at my desk in the office. I\'ve had it for a while. The office is normally about 70 degrees farenheight, and it sits under lots of fluorescent lighting. It has these weird bumps growing on the bottom of one of the leaves. I noticed because on the top of the leaf there are brown spots and when I turned the leaf over I saw the bumps on the underside. Can anyone tell me what these are? Fungus? Air roots? I have no idea.
Thanks!