Visit us at

Diatoms of the United States is now known as Diatoms of North America.
This site has been redesigned and updated, and will be closing soon.


Fragilariforma virescens

(Ralfs) D.M.Williams and Round 1988      Category: Araphid
BASIONYM: Fragilaria virescens
SYNONYM(S): Neofragilaria virescens (Ralfs) D.M.Williams and Round 1987 

Fragilariforma polygonata


Frickea lewisiana

LM scalebar = 10 ┬Ám

Slide Number: INSTAAR Diatom Collection 15976

Site ID: BDB-000054115

Site Name: Contoocook River At Peterborough, Nh

Latitude: 42.8626

Longitude: -71.9592

Contributor: Eduardo A. Morales | Sarah Spaulding - October 2011