inner part of a compound aperture.  endoplica fold of the inner exine layer. 
imaginary line around a pollen grain at the distance half-way between the (proximal and distal) poles. 
preposition indicating a direction on the pollen surface; see equator.
diameter of a pollen grain or spore in the equatorial plane. 
the view of a pollen grain or spore perpendicular to the polar axis. 
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