Structural colour in the mossSphagnum subnitensRuss. & Warnst

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Abstract
The blue-grey sheen of dried specimens of S. subnitens is attributed to thin film interference in the walls of the hyaline cells, this being produced by reflection from upper and lower film surfaces. The reflectance is large in air and small in water, so that the color is visible only in dried specimens. S. rubelhum lacks the blue-grey sheen because only a small part of the total area of the hyaline cells is thin enough to generate interference color.

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