Using the link below, you can search for all ferns (or any other type of plant) that are native to the U.S. and are found in PA.

You can also search for non-native ferns that are located in PA.

Here is a link that might be useful: USDA Advanced Search

What a great link! Thanks.

Yes northeastwisc, a great link. For some reason Pa. is not
in it.

You can find Pennsylvania in the second box under "1. Distribution". Just hit the little arrow on the bottom of the scrool bar until you get down to Pennsylvania.

To see it in the results list, you have to be sure to check the little box way to the right side of the page - "Display in Report".

The link above is no longer valid. See copy of message on that link:

The page you requested can not be found. Recently the PLANTS Database Web Site was redesigned. It's possible the page you are looking for has been renamed. Please use the links on the left to find what you're looking for or use the name search form on the left to look up a plant. Please use the Help or Contact Us links if you need more information. If you were referred to this page by another Web site, please let them know that their links to PLANTS may be outdated.

The redesign of the PLANTS is part of the USDA Web Modernization project.

It's been over six years since that was posted. Looks like it got moved to http://plants.usda.gov/adv_search.html