Diatoms of North AmericaDiatoms of North America
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Compare Pinnularia borealis

Ehrenb. 1843

Compare

Valves of P. borealis var. lanceolata are elliptic-lanceolate in outline and may be up to 12 µm wide. Valves of P. lata are much larger and have only 2-4 striae in 10 µm. Pinnularia rabenhorstii has larger valves 12-18 µm wide, with broadly subrostrate apices.

LM scalebar = 10 µm
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

Pinnularia borealis var. lanceolata

Hust. in Schmidt et al. 1934

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 lata

(Bréb.) Rabenh. 1853

Pinnularia lata LM6 Pinnularia lata LM11 Pinnularia lata LM5 Pinnularia lata LM10 Pinnularia lata LM12 Pinnularia lata LM13
Length Range
80.2-127.6 µm
Width Range
23.2-28.7 µm
Striae in 10 µm
3-4

Pinnularia rabenhorstii

(Grunow) Krammer 2000

Pinnularia rabenhorstii LM1 Pinnularia rabenhorstii LM2 Pinnularia rabenhorstii LM3 Pinnularia rabenhorstii LM4 Pinnularia rabenhorstii LM5 Pinnularia rabenhorstii LM6 Pinnularia rabenhorstii LM7
Length Range
49.6-71.1 µm
Width Range
12.1-17.9 µm
Striae in 10 µm
4-5