Fern scales arranged in a star pattern, Elaphoglossum cuspidatum, Columbia, South America

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Photo credit: © Scenics & Science / Alamy / Afripics
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Keywords: anisotropic, birefractive, birefringence, birefringent, cross, dancing, frond, micrograph, microscope, nichol, pastime, photomicrograph, polariscope, polarised, polarized, prisms, star, victorians