Observations on North American Populations of Stephanodiscus (Bacillariophyceae) Species Attributed to Friedrich Hustedt

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Abstract
S. alpinus is moderate in diameter, concentrically undulate and heavily silicified. Spine placement on valves from North American populations is variable and may differ from European material. North American specimens also tend to be more coarsely fasciculate. S. tenuis is distinguished by a rosette of areolae in the valve center. S. dubius is heavily silicified and concentrically undulate. The presence of alveoli near the margin of S. dubius distinguishes it from other Stephanodiscus species.

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