Narrow-leaved Sword-fern, Imbricate Sword Fern
Polystichum imbricans ssp. imbricans
Synonym: Polystichum munitum var. imbricans
Imbricate sword fern growing from a horizontal crack in a rock on open slopes at the Labyrinth in the mid-Columbia River Gorge...............February 28, 2010.
Ventral and dorsal leaflet surfaces of imbricate sword fern. Note the spine-tipped teeth which are more outwards pointing than those of the similar western sword fern (Polystichum munitum) which is found in the forest in this region.
Paul Slichter