Sorry. I see you posted the picture while I was still typing my request for you to post one.
I think you have some type of pest but let's see what else someone has to say.
Is it possible that you could post a picture of your fern, preferably with a close-up so we can see the white dots? If they're sticky, I'm guessing that they're pests. Are the dots on the underside or the top or allover the plant?
Many ferns have reddish 'dots' on the underside of their leaves. These are actually spores which is how the ferns multiple. For all I know, maybe some ferns have white dots.
I'm sure someone else will hop in here with a better answer. But again, a picture would help.