Diatoms of North AmericaDiatoms of North America
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Guide to Achnanthidium alpestre

(R.L.Lowe and Kociolek) R.L.Lowe and Kociolek in J.R.Johans. et al. 2004

A Alpestre Guide Copy
Credit: Marina Potapova
  1. Valves linear-lanceolate with blunt, subrostrate ends
  2. Stria density high, 25-32 at valve center

Valves linear-lanceolate with subrostrate ends. The striae are parallel or very slightly radiate throughout both valves. The striae are very dense, up to 28-32 in 10 μm in the valve center. The axial area is narrow and only slightly widened in the valve center.