Asplenium vespertinum is a fern that is native to California, and endemic (limited) to California.
California Rare Plant Rank: 4.2 (limited distribution).
[Wikipedia] Range, Habitat: It is native to southern California and Baja California, where it grows in moist, shady, rocky places, such as the shadows beneath cliff overhangs. (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: 04/17/2025).