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Guide to Chamaepinnularia mediocris

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

Chamaepinnularia Mediocris Guide
Credit: Megan Otu
  1. Valves linear to broadly oval
  2. Central valve gibbous
  3. Striae composed of single chamber

Valves are linear to broadly oval, with rounded apices and a gibbous (expanded) middle. The central area is a transverse fascia: in some specimens it extends to the valve margins, in other specimens short irregular striae are present at the margins. The striae are parallel and composed of a single, elongate chamber.