Differentiate pteridophyte

In the biology experiment, our team should to make a research for pteridophyte. We should to differentiate all kinds of pteridophyte in the campus. Pteridophyte is very hard to differentiate, because too many pteridophyte are the same apparel. You has to look carefully, and the little different of them. And then you can know what kind the pteridophyte is. I also get some pteridophyte back to plant in the room. And we give them different conditions to search what they become to. The conditions are hot, dark, light, dry, wet and wind. We fail one time, but the second time we are success. The experiment about is very smooth now. I wish we can have a great grade.