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LM (A) and SEM (B–I) micrographs of Oryctanthus alveolatus (WU: from Ecuador, coll. J. R. Abbott, s.n.). A. Two pollen grains in equatorial and polar view. B–E. Pollen grains in polar view. F, G, H. Close-ups of lophae junction showing colpus (arrow) and adjacent mesocolpium (mc) and apocolpium (ac). I. Close-up of polar lacuna. Scale bars – 10 µm (A–E), 1 µm (F–I).
