Green alga
- kingdom: Plantae
- phylum: Chlorophyta
- class: Chlorophyceae
- order: Sphaeropleales
- family: Hydrodictyaceae
- genus: Pediastrum
- species: Pediastrum duplex
Coimbra
Coimbra
Portugal
South Coventry
Connecticut- North Eastham
- Tewksbury
Massachusetts
United States