Diatoms of North AmericaDiatoms of North America
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Guide to Geissleria kriegeri

(Krasske) Lange-Bert. in Lange-Bert. and Metzeltin 1996

Geissleria Kreigeri Guide Copy
Credit: Marina Potapova
  1. Valves elliptical-lanceolate with subrostrate apices
  2. Central area small
  3. Areolae in central area absent
  4. Annulae consist of 3-4 pairs of striae at poles

Valves are elliptical-lanceolate with subrostrate ends, 5.0-7.5 µm wide and 11-23 µm long. The central area is small, without isolated areolae. Striae are uniseriate, radiate, and number 16-23 in 10 µm. Annulae consist of three to four pairs of striae at each pole.