Hawaii - Cyrtomium

We found two species of Cyrtomium in the Mauna Loa Bird Park near Volcano National Park. I'm very partial to this genus because it's commonly found in greenhouses and botanical garden conservatories where they want to create a very tropical-feeling environment, but it's rarely labelled. It also doesn't look much like a fern unless you turn it over and notice the sori.

This is Cyrtomium caryotideum:

And Cyrtomium falcatum: