serrated earth moss
- kingdom: Plantae
- phylum: Bryophyta
- class: Bryopsida
- order: Funariales
- family: Ephemeraceae
- genus: Ephemerum
- species: Ephemerum serratum
- Sierning
Upper Austria
Austria- Antrim
- Downpatrick
Northern Ireland
United Kingdom- Petaluma
California- Amesbury
- Cambridge
- Somerville
Massachusetts- Camden
- Wood-Lynne
New Jersey
United States