Grunow 1878 Category: Symmetrical biraphid
BASIONYM: Mastogloia smithii var. lacustris Grunow 1878
Contributor: Pat Kociolek - March 2011
Length Range: 30-54 µm
Width Range: 8-10 µm
Striae in 10 µm: 15-17
Valves are linear-lanceolate with margins slightly convex to nearly straight and apices bluntly produced. The axial area is straight, narrow and expanded to form an asymmetric, elliptic to nearly rectangular central area. The raphe is straight and filiform, becoming lateral at about ½ the way between the apex and central area. External proximal raphe ends are enlarged. Striae are distinctly punctate and radiate, except at the apices where they are parallel.
Co-occurs with the nominate variety in alkaline, lentic habitats.
Basionym: Mastogloia smithii var. lacustris
Author: Grunow 1878
Length Range: µm
Striae in 10 µm: