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Guide to Navicula hasta

Pant. 1892

Navicula hasta guide2
  1. Central striae broadly spaced
  2. Central striae wide
  3. Striae strongly radiate
  4. Apices protracted, apiculate

A few central striae are more widely spaced and more broad than other striae. Striae are strongly radiate throughout. Apices are protracted and apiculate. The central area is transversely elliptic.