Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Neidium rugosum

P.B.Hamilton, M.G.Potapova and L.I.Kopyrina 2014

Neidium rugosum guide33
  1. Valves moderately large
  2. Valve margins convex
  3. Proximal raphe ends variable in length and curvature
  4. Striae number 16-18 in 10 µm
  5. Axial area with longitudinal ridges

Valves are moderately large, with convex margins. Proximal raphe ends are variable in length and curvature. Striae number 16-18 in 10 µm. The axial area contains longitudinal ridges, a feature discernible in SEM.