Not really a plant id question. The plant is a fern of some sort I guess. I'm wondering what the things attached to the underside of the leaves are. Insect eggs? Amazingly orderly.
How about snagging a book on How to Know the Ferns at the bookstore next time you visit? I will give you a clue: It is a four lettered word that starts with a S and ends with an I S _ _ I Now go out and find out!!
Sori. I entertained the thought that they were spores of some sort for < 1 second, but dismissed it. I'm mostly focused on fungi.