This good article cites me and our research team, and gives some visibility to die-off sites on the Kitsap Peninsula.
https://www.kitsapsun.com/story/news/2018/09/15/kitsap-forests-ferns-dying-why/1290844002/
We invite anyone with observations of sword fern die-off in western Washington, to add your description and photos to the map on the following site:
https://www.inaturalist.org/projects/sword-fern-die-off-in-puget-lowland-forests
This will allow us to get a handle on the extent and pattern of die-off around the region. And, with good photos, we can begin visiting and re-visiting these sites to document spread or recovery.
Tim Billo: University of Washington, Environmental Studies 