Krammer and Lange-Bertalot 2000 Category: Symmetrical biraphid
BASIONYM: Pinnularia balfouriana Grunow ex Cleve 1895
Contributor: Pat Kociolek - January 2011
Length Range: 5-19 µm
Width Range: 3-5 µm
Striae in 10 µm: 10-12
Valves are broadly linear to nearly elliptical in outline with rounded ends. The axial area narrow at the poles, widening to form a linear-elliptical to lanceolate central area. The raphe is straight, filiform, with distal ends not reaching the apices. The proximal raphe ends terminating quite a distance from one another. Striae are prominent, without visible punctuation in the LM, and radiate throughout.
Comments: Valve ultrastructure was used (Krammer 2000) to differentiate this genus from Pinnularia; this is the only species of the genus known in the US flora. This taxon is found in cool or mountainous regions across the US.
Basionym: Pinnularia balfouriana
Author: Grunow ex Cleve 1895
Length Range: µm
Striae in 10 µm:
Krammer, K. (2000). The genus Pinnularia. The Diatoms of Europe. Diatoms of Inland Waters and Comparable Habitats 1: 1-703.
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.