Jørgensen 1948 Category: Symmetrical biraphid
BASIONYM: Navicula leptostriata Jørgensen 1948
REPORTED AS: Navicula heimansii (Van Dam and Kooyman 1982)
Contributor: Loren Bahls - March 2012
Length Range: 33-39 µm
Width Range: 4.9-5.7 µm
Striae in 10 µm: 19-20
Valves are narrowly lanceolate with acutely rounded, subtly protracted apices. Valves are lightly silicified and features tend to be faint and difficult to resolve. The raphe is filiform. Proximal raphe ends are very close and deflected to the primary side. The axial area is very narrow. The central area is small, transversely widened, and asymmetrical with irregular borders. Striae are curved and strongly radiate near the valve middle, becoming strongly convergent near the apices. Areolae are very close together and cannot be distinguished in LM.
Basionym: Navicula leptostriata
Author: Jørgensen 1948
Length Range: µm
Striae in 10 µm:
Jørgenson, E.G. (1948). Diatom communities in some Danish lakes and ponds. Det Kongelige Danske Videnskabernes Selskab, Biologiske Shrifter 5(2): 1-140.
Navicula leptostriata has been recorded from eight streams and small lakes in the northern Rocky Mountains, where it is typically associated with Navicula notha. The mean pH at these locations is 7.5 and the mean specific conductance is 154 µS/cm.
Summit Lake, Waterton Lakes National Park, Alberta: home of Navicula leptostriata.
Credit/Source: Photo courtesy of Barb Johnston, Parks Canada.