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In this paper we report evidence of structural color inMyxomycetes, a group of eukaryotic microorganisms with an uncertaintaxonomic position. We investigated the Diachea leucopoda, which belongsto the Physarales order, Myxomycetes class, and found that its peridium-protective layer that encloses the mass of spores- is basically a corrugatedlayer of a transparent material, which produces a multicolored pointillisticeffect, characteristic of this species. Scanning (SEM) and transmission(TEM) electron microspcopy techniques have been employed to characterizethe samples. A simple optical model of a planar slab is proposed tocalculate the reflectance. The chromaticity coordinates are obtained, and theresults confirm that the color observed is a result of an interference effect.