Diatoms of North AmericaDiatoms of North America
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Guide to Cylindrotheca gracilis

(Bréb. ex Kütz.) Grunow in Van Heurck 1882

Cylindrotheca gracilis guide
  1. Valves elongate-linear, spindle shaped
  2. Frustule twisted about apical axis
  3. Apices protracted, subcapitate

Frustules are weakly silicified. The valves are elongate-linear and spindle shaped. Frustules are twisted about the apical axis. Apices are protracted and appear subcapitate from some angles.