Mannia californica
- kingdom: Plantae
- phylum: Marchantiophyta
- class: Marchantiopsida
- order: Marchantiales
- family: Aytoniaceae
- genus: Mannia
- species: Mannia californica
- Pasadena
- Sacramento
- West Menlo Park
California- Tryon
North Carolina- Dayton
Tennessee
United States