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LM (A) and SEM (B–I) micrographs of Oncocalyx welwitschii (WU 039064). A. Two pollen grains in equatorial and polar view. B–E. Pollen grains in polar view. F. Close-up of central polar area. G. Close-up of apex. H, I. Close-ups of mesocolpium. Scale bars – 10 µm (A–E), 1 µm (F–I).
