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Common oak fern on Little Si - Flickr - brewbooks

Image of Polypodiopsida

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Summary[edit] Description: I believe this is Dryopteris expansa based on ID help on iNaturalist and looking at Burke Museum Herbarium images biology.burke.washington.edu/herbarium/imagecollection.ph.. Originally thought this was Gymnocarpium dryopteris (Common oak fern ) not certain. Little Si at elevation about 350 meters (1150 feet) IMG_20160421_174558. Date: 21 April 2016, 17:45. Source: Common oak fern on Little Si. Author: brewbooks from near Seattle, USA. Camera location 47° 30′ 03.02″ N, 121° 45′ 18.18″ W : View all coordinates using: OpenStreetMap - Google Earth: 47.500838; -121.755050.

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