(Patrick) Johansen 2004 Category: Symmetrical biraphid
BASIONYM: Navicula mutica var. stigma Patrick 1959
Contributor: Ian Bishop - December 2015
Length Range: 23-39 µm
Width Range: 6.9-9.2 µm
Striae in 10 µm: 19-22
Valves are lanceolate with broadly rounded, protracted apices. The central area is transverse with marginal areolae and a single, distinct stigma positioned near the valve margin. Striae are radiate and increasingly so toward the apices. Areolae are coarse and easily visible in LM, measuring 16-18 in 10 µm at mid-valve, increasing to 20 µm at the apices. The axial area is narrow and linear, expanding slightly toward the central area. The raphe is filiform, with both proximal raphe ends deflected unilaterally, away from the isolated stigma.
Basionym: Navicula mutica var. stigma
Author: Patrick 1959
Length Range: 21-36 µm
Width Range: 7-11 µm
Striae in 10 µm: 16-19 at center; up to 24 at ends of valve
Valve broadly lanceolate with broadly rostrate ends, and axial area narrow, central area transverse. On one side of the central nodule a distinct stigma. Striae radiate throughout the valve. Strie, 16-19 in 10 µ at center of valve to 24 in 10 µ at ends of valve. Length, 21-36 µ (type, 36 µ). Breadth, 7-11 µ (type, 11 µ).
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Patrick, R.M. (1959). New species and nomenclatural changes in the genus Navicula (Bacillariophyceae). Proceedings of the Academy of Natural Sciences of Philadelphia 111 (1959): 91-108 . http://www.jstor.org/stable/4064508
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