Diatoms of North AmericaDiatoms of North America
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Guide to Geissleria punctifera

(Hust.) Metzeltin, Lange-Bert. and García-Rodríguez 2005

Geissleria Punctifera Guide2
  1. Valves lanceolate with broadly subrostrate apices
  2. Central area formed by one shortened stria at each side
  3. One isolated areola in central area
  4. Annulae consist of 3 pairs of striae at poles

Valves are lanceolate with subrostrate broadly rounded ends, 6.0-8.5 µm wide and 16-27 µm long. The central area is small, formed by one shortened stria on each side of the valve, with an isolated stigma. Striae are radiate, 16-18 in 10 µm. The annulae consist of three pairs of striae at each pole.