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