(Grunow in Cleve and Grunow; Grunow in Van Heurck) Stroganov et al. 1927 Category: Nitzschioid
BASIONYM: Nitzschia calida Grunow in Cleve and Grunow; Grunow in Van Heurck
Contributor: Pat Kociolek - September 2011
Length Range: 27-54 µm
Width Range: 8-10 µm
Striae in 10 µm: 30-32
Valves linear, slightly concave in the middle of the valve, apices narrow, drawn out and narrowly rounded. The keel is strongly excentric, with the central nodule formed by two fibulae more distant from the others along the keel. Fibulae 7-9 in 10 µm. A narrow, indistinct fold runs along the longitudinal axis of the valve. The fold is barely undulate or may even appear not to rise or taper from the main valve surface. Transapical ribs distinct, about 12-16 in 10 µm. Striae are indistinct, seen only with DIC or oblique light with brightfield microscopy.
Stroganov (1927) made the valid transfer of Nitzschia calida Grunow in Cleve &Grunow to Tryblionella before Mann in Round et al.(1990).
Basionym: Nitzschia calida
Author: Grunow in Cleve and Grunow; Grunow in Van Heurck
Length Range: µm
Striae in 10 µm:
Krammer, K. and Lange-Bertalot, H. (1988). Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/2. Gustav Fisher Verlag, Jena.