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Guide to Mastogloia lacustris

(Grunow) Van Heurck 1880

Mastogloia Smithii Lacustris Guide
Credit: Pat Kociolek
  1. Valves linear-lanceolate
  2. External proximal raphe ends enlarged
  3. Width 8-10 µm

Valves linear-lanceolate, with margins slightly convex to nearly straight. The apices are bluntly produced. The raphe is straight and filiform, becoming lateral at about ½ the way between the apex and central area. The proximal raphe ends are enlarged. Striae are distinctly punctate and radiate, except at the apices where they are parallel.