[Wikipedia] Range, Alternate Name: The subspecies americanum is found in the mountains of western United States, Alaska, Canada and coastal Greenland,[5] and is sometimes classified as a separate species Athyrium americanum. (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 05/10/2025).
