Compare Fragilariforma bicapitata
Fragilariforma viriscens has a higher stria density and the valve is more lanceolate and less linear than F. bicapitata. Fragilariforma nitzschioides also has a higher stria density, but has distinctly linear valves across the entire size range.
LM scalebar = 10 µm
Length Range
9.1-51.1 µm
9.1-51.1 µm
Width Range
2.9-5.5 µm
2.9-5.5 µm
Striae in 10 µm
11-15
11-15
Length Range
15-60 µm
15-60 µm
Width Range
6.5-7.0 µm
6.5-7.0 µm
Striae in 10 µm
20-22
20-22
Length Range
19-54 µm
19-54 µm
Width Range
3.5-5.5 µm
3.5-5.5 µm
Striae in 10 µm
18-25
18-25
