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Pteridophyta
Hello redyellgrn99,
Welcome to Project Noah! Max is correct, this is not a fern. A great resource for plants in Cali is Calflora: http://www.calflora.org/
Your wild (non domesticated or planted) spottings would be a great addition to the Southern California Wildlife mission: http://www.projectnoah.org/missions/7964...
I believe this is actually immature hemlock (Conium maculatum) and not a fern.