Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia borealis var. lanceolata

Hust. in Schmidt et al. 1934

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Elliptic-lanceolate valves distinguish P. borealis var. lanceolata from the nominate variety, which has linear to linear-elliptic valves.

LM scalebar = 10 µm
Pinnularia borealis var lanceolata LM1 Pinnularia borealis var lanceolata LM2 Pinnularia borealis var lanceolata LM3 Pinnularia borealis var lanceolata LM4 Pinnularia borealis var lanceolata LM5 Pinnularia borealis var lanceolata LM6 Pinnularia borealis var lanceolata LM7
Length Range
27.5-56.6 µm
Width Range
8.6-11.8 µm
Striae in 10 µm
5-6

Pinnularia borealis

Ehrenb. 1843

Pinnularia borealis LM7 Pinnularia borealis LM6 Pinnularia borealis LM5 Pinnularia borealis LM4 Pinnularia borealis LM3 Pinnularia borealis LM2 Pinnularia borealis LM1
Length Range
27.1-47.6 µm
Width Range
8.0-10.2 µm
Striae in 10 µm
5-6