helmet moss
- kingdom: Plantae
- phylum: Bryophyta
- class: Bryopsida
- order: Bryales
- family: Bartramiaceae
- genus: Conostomum
- species: Conostomum tetragonum
Bowen Island
British Columbia
Canada
Narsaq
Kujalleq
Greenland
Arjeplog
Norrbotten- Vilhelmina
Västerbotten
Sweden
Herkimer