Patrick and Freese 1961 Category: Symmetrical biraphid
BASIONYM: Navicula elsoniana Patrick and Freese 1961
Contributor: Paul Hamilton - May 2012
Length Range: 29.5–38.5 µm
Width Range: 11–11.5 µm
Striae in 10 µm: 11
Valves are widely lanceolate with protracted rounded apices. Striae are radiate at the center and convergent at the apices. The central area is large and asymmetric. The axial area is narrow, straight and slightly elevated. The raphe is filiform and linear. The proximal raphe ends are linearly expanded as a pore.The distal fissures are weakly hooked. Areolae are lineate. In LM, a thickened central nodule is not evident.
Basionym: Navicula elsoniana
Author: Patrick and Freese 1961
Length Range: 39–43 µm
Width Range: 10–12 µm
Striae in 10 µm: 10–11
Valves broadly lanceolate with protracted, narrow, rounded ends. Axial area narrow and together with the central nodule, distinct from the central area. Central area large, orbicular, formed by the slightly irregular shortening of the striae around the central area. Striae distinctly lineate, radiate throughout most of the valve. Striae at the ends of the valve convergent. Striae 10–11 in 10 µm. Length, 39–43 µm. Breadth, 10–12 µm
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Patrick, R.M. and Freese, L.R. (1961). Diatoms (Bacillariophyceae) from Northern Alaska. Proceedings of the Academy of Natural Sciences of Philadelphia 112(6):129-293.
Witkowski, A., Lange-Bertalot, H. and Metzeltin, D. (2000). Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.