Gymnostomum calcareum
- kingdom: Plantae
- phylum: Bryophyta
- class: Bryopsida
- order: Pottiales
- family: Pottiaceae
- genus: Gymnostomum
- species: Gymnostomum calcareum
- Losenstein
- Reichraming
- Sierning
Upper Austria
Austria- Belleville
Ontario- Montréal
Quebec
Canada- Luxembourg
- El Paso
Canary Islands
Spain- Felton
California- Harvey
- New Orleans
Louisiana- Carterville
- Webb City
Missouri- Cayuga Heights
- East Ithaca
- Ithaca
- Northeast Ithaca
New York- Hometown
Pennsylvania- Dayton
Tennessee- Bryn Mawr-Skyway
- Tukwila
Washington
United States