Bigelow's Spikemoss (Selaginella bigelovii) is a Lycophyte (NOT a fern) in the Spikemoss (Selaginellaceae) family. It is native to California and Baja California, where it grows in rocky places in many different habitat types, from the coastline to the mountains to the deserts. This lycophyte forms clumps of spreading upright to erect stems up to 20 centimeters long with a few short lateral branches. The linear or lance-shaped green leaves are up to 4 millimeters long, including the tiny rigid bristles at the tips.
It is a UV fluorescent organism (it can be tested and confirmed using a black light at night).
Calflora (with species distribution map in CA): https://www.calflora.org/app/taxon?crn=7462
Jepson eFlora https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=44043
Flora of North America: http://floranorthamerica.org/Selaginella_bigelovii
Anza-Borrego Desert Wildflowers /https://borregowildflowers.org/?type=search&searchtype=S&family=&name=Selaginella%20bigelovii
Really over run with dried grass, sorry.