Rocky Mountain Woodsia, Laurentian Cliff Fern
Woodsia scopulina
Laurentian cliff fern (possibly ssp. laurentiana) as seen on rocks along the upper trail to McCord Creek, western Columbia River Gorge.........April 22, 2015.
Close-up of the ventral leaflet of Laurentian cliff fern. Note the numerous gland-tipped hairs on the underside of the pinnae.
Paul Slichter