Sorus

[Nogauthi]

Hi i just bough java fern and saw dots under some leafs. I has trying to scrap them all off because I though they where snail eggs. The store was infested. Now I just read that they are sorus. What is it? And what do I do with that?

 

[tarpon]

They are spores. It's how the plant reproduces as I understand it. They are of no harm and you don't have to do anything with it.
You could post a picture so we can be sure that's What it is if you want though?