Scale bar = 10µm

Length range = 50.67-56
Width range = 10-10.7

Silver Lake Fen (Pond)

Valves are clavate. Tmid at center and two constictions along the margin. The valve broadens near the headpole and then becomes apiculate. Both headpole and footpole are rounded. Raphe is undulate. External prixmal raphe ends are diatled. Striae are radiate.

Disntict from other Gomphonema in valve shape.