Oak Fern, also called Western Oak Fern, is most likely found in areas that appear as understory or forest. A Fern and a member of the Dryopteridaceae Family, it grows by Kiosk 14 (right next to the Oregon White Oaks, although planted purposely).  Pilchuck Learning Center’s sponsored Western Washington State University SAM Project extinction possibility is slight; unlikely to be extinct soon as it is found in other areas of North America.  Little use reported although it does serve as a sign of water being nearby.  Perhaps not important today, but once for those who were thirsty it was (although only observed during the non-winter months as it is deciduous).

http://naeb.brit.org/uses/search/?string=Gymnocarpium+dryopteris
https://burkeherbarium.org/imagecollection/taxon.php?Taxon=Gymnocarpium%20disjunctum
https://en.wikipedia.org/wiki/Gymnocarpium_dryopteris
https://plants.usda.gov/core/profile?symbol=GYDR
https://www.plc215.org/wp-content/uploads/2019/02/Kiosk-14.pdf
http://www.burkemuseum.org/research-and-collections/botany-and-herbarium/collections/database/results.php?Genus=Gymnocarpium&Species=dryopteris&SourcePage=search.php&IncludeSynonyms=Y&SortBy=DESC&SortOrder=Year

The Oak Fern and Garry Oak growing together is:

rare if ever
often found
very often found

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