Compare Fragilariforma acidobiontica
Fragilariforma nitzschioides, F. virescens, and F. acidobiontica all have linear valves with protracted ends, but the latter differs by having a lower stria density and the lack of a distinct sternum. Similar in valve outline to S. exiguiformis, F. acidobiontica differs by its more narrow apices, lower stria density and greater length.
LM scalebar = 10 µm
Length Range
32-67 µm
32-67 µm
Width Range
3-4 µm
3-4 µm
Striae in 10 µm
12-14 in the center valve, 14-15 at the ends
12-14 in the center valve, 14-15 at the ends
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
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
4-22 µm
4-22 µm
Width Range
3-4 µm
3-4 µm
Striae in 10 µm
16-20
16-20
