How many types of aperture are there?
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An aperture is a thin or missing part of the exine, which is independent of the patterning of the exine. Two different types of apertures can be distinguished: pores and fissures (colpi). The latter are more primitive, they are elongated with pointed ends.
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Two different types of apertures can be distinguished: pores and fissures (colpi). The latter are more primitive, they are elongated with pointed ends. Pores are usually isodiametric. They can also be slightly elongated but, in contrast to colpi, they have rounded ends.
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