Common Ladyfern, Northwestern Ladyfern, Northwestern Lady Fern
Athyrium filix-femina var. cyclosorum
Synonym: Athryium filix-femina ssp. cyclosorum
The photo above shows the distinctive shape of the subarctic lady fern as seen in moist coniferous forest at the eastern edge of Swampy Meadows on the western slopes of Mt. Adams.........August 11, 2008.
Close-up images of the sori beneath the leaflets of northwestern lady fern as seen along the Lake Creek Trail #378, Strawberry Mountain Wilderness.........August 10, 2015. The sori are curved, located near the midline of the leaflet, and have an indusium as compared to those of Athyrium alpestre, which have round sori found along the margin of the leaflet, and lacking an indusium.
The photo above shows the upper portion of a frond of lady fern as seen in wetland forest adjacent to Willard Springs in Conboy Lake NWR........July 31, 2008.
A large clump of lady fern growing alongside upper Little Pine Creek along the Canyon Mountain Trail #218, Strawberry Mountain Wilderness.........August 19, 2011. Columbia monkshood (Aconitum columbianum), streambank arnica (Arnica amplexifolius) and sharptooth angelica (Angelica arguta) can also be seen around the lady fern.
Lady fern growing in a small spring-fed stream that crosses the Lake Creek Trail #378 within the first mile of the trail above the trailhead, Strawberry Mountain Wilderness..........July 19, 2013.