Frost s crystalwort
- kingdom: Plantae
- phylum: Marchantiophyta
- class: Marchantiopsida
- order: Marchantiales
- family: Ricciaceae
- genus: Riccia
- species: Riccia frostii
Ottawa
Ontario
Canada
Phoenix
Arizona- Little Rock
- North Little Rock
Arkansas- Oakland
California- Denver
Colorado- Canton
- North Peoria
- Peoria
Illinois- Bloomington
Indiana- Kansas City
- Lawrence
- Manhattan
- Topeka
Kansas- Natchitoches
- New Orleans
- Westwego
Louisiana- Great Falls
- Missoula
Montana- Lincoln
Nebraska- Las Cruces
New Mexico- Fargo
North Dakota- Oroville
Washington
United States