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Centre of valve showing the inner termini of the raphe structure, phase contrast micrograph of empty frustule.
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Filamentous diatom commonly found near the Tvarminne Zoological Station. Previously known as Achnantes taeniata.
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Pennate diatom, valve view of an empty frustule (shell). Phase contrast optics.
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Detail showing plastids inside several cells at the end of a filament. Same filament as included in another picture in this collection.
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The larger more boat-like frustules are of Anomoeoneis, the squarer ones are probably Surirella. Phase contast optics.
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Frustules.Some kind of differential interference contrast optics.
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