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compound aperture composed of a colpus fektoaperture) combined with an endoaperture of variable size and shape.

caput

Iris alata Iridaceae pollen surface with clavae colporoidate

Eucommia sp. Eucommiaceae, fossil equatorial view caput

Iris alata Iridaceae pollen surface with clavae colporoidate

Eucommia sp. Eucommiaceae, fossil equatorial view colpus flat., pl. colpi)

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