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Distribution by County   100    
Adiantum aleuticum  (Rupr.) C. A. Paris
Five finger fern
Adiantum aleuticum is a fern that is native to California, and also found elsewhere in North America and beyond.
Record Count by County

Alameda: 5 Madera: 2 Riverside: 4 Siskiyou: 81
Amador: 3 Marin: 74 San Bernardino: 17 Solano: 1
Butte: 27 Mariposa: 14 San Francisco: 1 Sonoma: 61
Contra Costa: 7 Mendocino: 68 San Luis Obispo: 16 Tehama: 5
Del Norte: 137 Mono: 1 San Mateo: 75 Trinity: 55
El Dorado: 11 Monterey: 65 Santa Barbara: 40 Tulare: 13
Fresno: 8 Napa: 14 Santa Clara: 29 Tuolumne: 3
Humboldt: 109 Nevada: 14 Santa Cruz: 99 Yuba: 2
Inyo: 3 Placer: 4 Shasta: 15
Los Angeles: 18 Plumas: 38 Sierra: 20

Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 12/09/2025).