Diatoms of North AmericaDiatoms of North America
Return to overview

Guide to Decussata

(Patrick) Lange-Bertalot 2000

Decussata Guide
Credit: Pat Kociolek
  1. Valves linear to linear-lanceolate
  2. Striae punctate
  3. Striae decussate

Decussata valves are linear to linear-lanceolate, with slightly rostrate ends. The striae are punctate, comprised of distinct, round areolae. The striae are decussate, meaning they appear to be organized into rows - a transapical row and two oblique rows.

Decussata includes two species, including the former Navicula placenta. Decussata placenta grows in low nutrient, slightly acidic seeps in Iowa. It is also known from moss and aerophilic habitats.

Diatoms of North America relies on the financial support of our user community. We aim to build our technical content by engaging diatomists at all levels and training the next generation. We need you to reach our 2025 fundraising goal of $25,000.

If you use and appreciate DONA, make your DONAtion today.

Give to diatoms.org