Diatoms of North AmericaDiatoms of North America
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Compare Navicula lanceolata

(C.Agardh) Ehrenb. 1838

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The valve ends of N. lanceolata are not apiculate, as they are in N. germainii. The valve is also broader in N. lanceolata and the striae are coarser. Navicula viridula is larger in size, with lower striae and areolae densities.

LM scalebar = 10 µm
Navicula lanceolata LM3 Navicula lanceolata LM7 Navicula lanceolata LM2 Navicula lanceolata LM6 Navicula lanceolata LM4 Navicula lanceolata LM1 Navicula lanceolata LM5
Length Range
30-60 µm
Width Range
9–12 µm
Striae in 10 µm
10–13

Navicula germainii

J.H.Wallace 1960

Gsn24379 04 1 Gs127032 Nagerm 1 Gc42397 Nagerm Notin Circle6 Gs127032 Nagerm 4 1 Gsn24379 01 Gsn24379 02 1 Gs127032 Nagerm 2
Length Range
32-39 µm
Width Range
7.0-8.3 µm
Striae in 10 µm
13-15

Navicula viridula

(Kütz.) Ehrenb. 1836

Gc107320 Gs141643 Naviridulacal4 Gc107320 Gs141643 Naviridulacal1 Gc107320 Gs141643 Naviridulacal7 Gc107320 Gs141643 Naviridulacal6 Gc107320 Gs141643 Naviridulacal5 Gc107320 Gs141643 Naviridulacal2 Gc107320 Gs141643 Naviridulacal3
Length Range
50-70 µm
Width Range
11.2-13.5 µm
Striae in 10 µm
8-9