Riccia campbelliana
- kingdom: Plantae
- phylum: Marchantiophyta
- class: Marchantiopsida
- order: Marchantiales
- family: Ricciaceae
- genus: Riccia
- species: Riccia campbelliana
Claremont- East Palo Alto
- Ione
- Ojai
- Palo Alto
- Sacramento
- Stanford
- Ukiah
California- Austin
- College Station
Texas
United States