pollen grain with a single saccus.  monosulcate, see sulcate 
Comment: superfluous term, because "sulcate" implies a single elongated aperture (sulcus).
exine elements forming the meshes in a reticulum. 
term used for light microscopy, describing the inner, unstructured layer/part of the exine. [21, 30]
Normapolles polar axis
group of Cretaceous and Lower Paleo-gene pollen, usually triaperturate, with a complex pore apparatus.
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